User's Guide Hammerfall® DSP System HDSPe AES ™ TotalMix 24 Bit / 192 kHz 9 ™ SyncAlign ZLM ™ ™ SyncCheck ™ SteadyClock PCI Express Digital I/O Card 32 Channels AES/EBU Interface 24 Bit / 192 kHz Digital Audio 32 x 16 Matrix Router 2 x MIDI I/O
General 1 2 3 4 5 6 Introduction ...............................................................6 Package Contents .....................................................6 System Requirements ..............................................6 Brief Description and Characteristics.....................6 Hardware Installation................................................7 Hardware – Connectors 6.1 External Connectors ..............................................7 6.2 Internal Connectors.........................
Driver Installation and Operation - Mac OS X 17 Driver and Flash Update 17.1 Driver Installation ................................................. 26 17.2 Driver Update....................................................... 26 17.3 Flash Update........................................................ 26 18 Configuring the HDSPe AES 18.1 Settings Dialog..................................................... 27 18.2 Clock Modes – Synchronization .......................... 29 19 Mac OS X FAQ 19.
26 TotalMix: The Matrix 26.1 Overview ..............................................................53 26.2 Elements of the Matrix View ................................53 26.3 Usage ...................................................................53 26.4 Advantages of the Matrix .....................................54 27 TotalMix Super-Features 27.1 ASIO Direct Monitoring (Windows only) ..............54 27.2 Selection and Group based Operation ................55 27.3 Copy Routings to other Channels .....
User's Guide HDSPe AES General User's Guide HDSPe AES © RME 5
1. Introduction Thank you for choosing the HDSPe AES. This unique audio system is capable of transferring digital audio data directly into a computer, from any device equipped with a AES/EBU or SPDIF interface. Installation is simple, even for the inexperienced user, thanks to the latest Plug and Play technology. The numerous unique features and well thought-out configuration dialog puts the Hammerfall DSP AES at the very top of the range of digital audio interface cards.
5. Hardware Installation Before installing the PCI Express card, please make sure the computer is switched off and the power cable is disconnected from the mains supply. Inserting or removing the card while the computer is in operation can cause irreparable damage to both motherboard and card! 1. Disconnect the power cord and all other cables from the computer. 2. Remove the computer's housing. Further information on how to do this can be obtained from your computer's instruction manual. 3.
6.2 Internal Connectors Expansion Board (X404) 26-pin connector for the included HDSPe AES Expansion Board. TCO (X403) 10-pin connector for a connection of the optional Time Code Option (TCO). SYNC IN (X400) Internal word clock input for synchronization of multiple cards via SYNC OUT. SYNC OUT (X401) This 3-pin connector carries an internal word clock signal. It can be used to synchronize multiple cards with sample accuracy, and without the need for an external connection.
In any case warranty does not cover damage caused by improper installation or maltreatment replacement or repair in such cases can only be carried out at the owner's expense. No warranty service is provided when the product is not returned to the local distributor in the region where the product had been originally shipped. Audio AG does not accept claims for damages of any kind, especially consequential damage. Liability is limited to the value of the Hammerfall DSP.
CE / FCC Compliance CE This device has been tested and found to comply with the limits of the European Council Directive on the approximation of the laws of the member states relating to electromagnetic compatibility according to RL2004/108/EG. FCC This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
User's Guide HDSPe AES Driver Installation and Operation - Windows User's Guide HDSPe AES © RME 11
10. Driver and Firmware 10.1 Driver Installation After the HDSPe AES has been installed correctly (see 5. Hardware Installation), and the computer has been switched on, Windows will recognize the new hardware component and start its ‘Hardware Wizard’. Insert the RME Driver CD into your CD-ROM drive, and follow further instructions which appear on your computer screen. The driver files are located in the directory \WDM on the RME Driver CD.
10.3 De-Installing the Drivers A de-installation of the HDSPe driver files is not necessary – and not supported by Windows anyway. Thanks to full Plug & Play support, the driver files will not be loaded after the hardware has been removed. If desired these files can then be deleted manually. Unfortunately Windows Plug & Play methods do not cover the additional autorun entries of TotalMix, the Settings dialog, and the registration of the ASIO driver.
11. Configuring the HDSPe AES 11.1 Settings Dialog Configuration of the HDSPe AES is done via its own settings dialog.
Clock Mode Sample Rate Sets the currently used sample rate. Offers a central and comfortable way of configuring the sample rate of all WDM devices to the same value, as since Vista the audio software is no longer allowed to set the sample rate. However, an ASIO program can still set the sample rate by itself. During record/playback the selection is greyed out, so no change is possible.
11.2 Settings Dialog - Pitch Usually soundcards and audio interfaces generate their internal clock (master mode) by a quartz. Therefore the internal clock can be set to 44.1 kHz or 48 kHz, but not to a value in between. SteadyClock, RME's sensational Low Jitter Clock System, is based on a Direct Digital Synthesizer (DDS). This superior circuitry can generate nearly any frequency with highest precision.
11.3 Clock Modes - Synchronisation In the digital world, all devices must be either Master (clock source) or Slave (clock receiver). Whenever several devices are linked within a system, there must always be a single master clock. A digital system can only have one master! If the card’s clock mode is set to 'Master', all other devices must be set to ‘Slave’. The HDSPe AES utilizes a very user-friendly, intelligent clock control, called AutoSync.
12. Operation and Usage 12.1 Playback The HDSP system can play back audio data in supported formats only (sample rate, bit resolution). Otherwise an error message appears (for example at 22 kHz and 8 bit). In the audio application being used, HDSPe must be selected as output device. This can often be found in the Options, Preferences or Settings menus under Playback Device, Audio Devices, Audio etc. We strongly recommend switching off all system sounds (via >Control Panel /Sounds<).
12.2 DVD-Playback (AC-3/DTS) AC-3 / DTS When using popular DVD software players like WinDVD and PowerDVD, their audio data stream can be sent to any AC-3/DTS capable receiver via the HDSPe AES. For this to work an output wave device has to be selected in >Control Panel/ Sounds and Multimedia/ Audio< or >Control Panel/ Sound/Playback<. Also check 'use preferred device only'. The DVD software's audio properties now show the options 'SPDIF Out' or similar.
12.3 Notes on WDM The driver offers a WDM streaming device per stereo pair, like AES (1+2). WDM streaming is Microsoft's current driver and audio system. WDM streaming is hardly usable for professional music purposes, as all data is processed by the so called Kernel Mixer, causing a latency of at least 30 ms. Additionally, WDM can perform sample rate conversions unnoticed, cause offsets between record and playback data, block channels unintentionally and much more.
12.5 Digital Recording Unlike analog soundcards which produce empty wave files (or noise) when no input signal is present, digital interfaces always need a valid input signal to start recording. Taking this into account, RME added a comprehensive I/O signal status display to the HDSPe AES, showing sample frequency, lock and sync status for every input.
13. Operation under ASIO 13.1 General Start the ASIO software and select ASIO Hammerfall DSP as the audio I/O device. The 'ASIO system control' button opens the HDSP's Settings dialog (see chapter 11 / 18, Configuration). The HDSPe AES supports ASIO Direct Monitoring (ADM). The HDSPe AES’ MIDI I/O can be used with both MME MIDI and DirectMusic MIDI. 13.
14. Using multiple HDSPe AES The current driver supports operation of up to three HDSPe AES. All cards of the HDSP and HDSPe system use the same driver, therefore can be used at the same time. All units have to be in sync, i.e. have to receive valid sync information either via word clock or by using AutoSync and feeding synchronized signals.
16. Hotline – Troubleshooting The newest information can always be found on our website www.rme-audio.com, section FAQ, Latest Additions. The dialog 'New hardware component found’ does not appear: • Check whether the PCI Express interface is correctly inserted in the PCI Express slot. The card and drivers have been installed correctly, but playback does not work: • Check whether the HDSPe appears in the Device Manager.
User's Guide HDSPe AES Driver Installation and Operation – Mac OS X User's Guide HDSPe AES © RME 25
17. Driver and Flash Update 17.1 Driver Installation First fit the card (see 5. Hardware Installation), then switch on the computer and install the drivers from the RME Driver CD. The driver file is located in the folder HDSPe Series. Installation works automatically by a double-click on the file HDSPe.pkg. RME recommends to download the latest driver version from the RME website! If done, the procedure is as follows: Double-click onto hdspe_x86_xx.
18. Configuring the HDSPe AES 18.1 Settings Dialog Configuring the HDSPe AES is done via its own settings dialog. The panel 'Settings' can be opened by clicking on the hammer icon in the dock. The mixer of the HDSPe AES, TotalMix, can be opened by clicking on the mixer icon in the dock. The Hammerfall DSP’s hardware offers a number of helpful, well thought-of practical functions and options which affect how the card operates - it can be configured to suit many different requirements.
Output Format Double Speed: Sample rates in the range of 64 kHz to 96 kHz can also be transmitted using the standard 48K frame. Note that when selecting Double Wire the number of output channels is reduced to 8. Quad Speed: Sample rates in the range of 128 kHz to 192 kHz can also be transmitted using either the standard 48K frame, or the 96K frame. Note that when selecting Double Wire the number of output channels is reduced to 8. When selecting Quad Wire the number of remaining output channels is 4.
18.2 Clock Modes - Synchronisation AutoSync The HDSPe AES has been equipped with AutoSync, an automatic clock source selection, which adopts the first available input with a valid digital signal as the clock reference input. The input currently used as sync reference is shown in the AutoSync Ref status field, together with its current sample frequency. AutoSync guarantees that normal record and record-while-play will always work correctly.
19. Mac OS X FAQ 19.1 Round about Driver Installation The driver with the file suffix zip provided by RME is a compressed archive. Zip is directly supported by OS X, a double click on the file is all one needs to do. The driver consists of a package file (pkg). A double click will start the OS X installer. The actual audio driver appears as a kernel extension file. The installer copies it to >System/ Library/ Extensions<. Its name is HDSPMADI.kext.
19.5 Various Information The driver requires 10.5.8 or higher. Via >System Preferences/ Audio-MIDI Setup< the hardware can be configured for the system wide usage. Programs that don't support card or channel selection will use the device selected as Standard-Input and Standard-Output. (Soundstudio, Mplayer, Amplitube etc.). In the lower part of the window, the audio hardware's capabilities are shown and can be changed in some cases. On the record side no changes are possible.
21. DIGICheck Mac The DIGICheck software is a unique utility developed for testing, measuring and analysing digital audio streams. Although this Windows software is fairly self-explanatory, it still includes a comprehensive online help. DIGICheck 0.64 operates in parallel to any software, showing all input data. The following is a short summary of the currently available functions: • Level Meter. High precision 24-bit resolution, 2/8/16 channels.
User's Guide HDSPe AES Connections and TotalMix User's Guide HDSPe AES © RME 33
23. Connections 23.1 AES/EBU Inputs The AES/EBU inputs are provided via 25 pin D-sub connectors with Tascam pinout (also used by Digidesign). A digital breakout cable will provide 4 female (and 4 male) XLR connectors per D-sub connector. Every input is transformer-balanced and ground-free. Channel status and copy protection are being ignored. The inputs can be used in any combination, e. g. it is sufficient to connect an input signal only to input 3.
Thanks to a highly sensitive input stage, also SPDIF signals can be processed by using a simple cable adapter phono/XLR. To achieve this, pins 2 and 3 of a male XLR plug are connected individually to the two pins of a phono plug. The cable shielding is only connected to pin 1 of the XLR not to the phono plug. 23.2 AES/EBU Outputs The AES/EBU outputs are provided via 25 pin D-sub connectors with Tascam pinout (also used by Digidesign).
The outputs of the HDSPe AES support all currently known formats in the range of 32 kHz up to 192 kHz. The current output format is defined in the section Output Format depending on the sample rate: Double Speed When the card operates in the range of 64 kHz to 96 kHz, Single Wire and Double Wire are available as output format. • Single Wire: 16 channels. 2 channels per AES wire. The effective sample frequency equals the clock on the AES wire (64 kHz – 96 kHz). • Double Wire: 8 channels.
24. Word Clock 24.1 Word Clock Input and Output SteadyClock guarantees an excellent performance in all clock modes. Based on the highly efficient jitter suppression, the HDSPe AES refreshes and cleans up any clock signal, and provides it as reference clock at the BNC output (see chapter 30.6). Input The HDSPe AES's word clock input is active when Pref. Sync Ref in the Settings dialog has been switched to Word Clock, the clock mode AutoSync has been activated, and a valid word clock signal is present.
24.2 Technical Description and Usage In the analog domain one can connect any device to another device, a synchronisation is not necessary. Digital audio is different. It uses a clock, the sample frequency. The signal can only be processed and transmitted when all participating devices share the same clock. If not, the signal will suffer from wrong samples, distortion, crackle sounds and drop outs.
In case the HDSPe AES resides within a chain of devices receiving word clock, plug a Tadapter into its BNC input jack, and the cable supplying the word clock signal to one end of the adapter. Connect the free end to the next device in the chain via a further BNC cable. The last device in the chain should be terminated using another T-adapter and a 75 Ohm resistor (available as short BNC plug). Of course devices with internal termination do not need T-adaptor and terminator plug.
25. TotalMix: Routing and Monitoring 25.1 Overview The HDSPe AES includes a powerful digital real-time mixer, the Hammerfall DSP mixer, based on RME’s unique, sample-rate independent TotalMix technology. It allows for practically unlimited mixing and routing operations, with all inputs and playback channels simultaneously, to any hardware outputs. Here are some typical applications for TotalMix: • Setting up delay-free submixes (headphone mixes).
User's Guide HDSPe AES © RME 41
25.2 The User Interface The visual design of the TotalMix mixer is a result of its capability to route hardware inputs and software playback channels to any hardware output. The HDSPe AES provides 16 input channels, 16 software playback channels, and 16 hardware output channels: For best screen display the channels have been arranged in three rows as known from an Inline desk, so that the row Software Playback equals the Tape Return of a real mixing desk: • Top row: Hardware inputs.
25.3 Elements of a Channel A single channel consists of various elements: Input channels and playback channels each have a mute and solo button. Below there is the panpot, realized as indicator bar (L/R) in order to save space. In the field below, the present level is displayed in RMS or Peak, being updated about every half a second. Overs (overload) are indicated here by an additional red dot. Next is the fader with a level meter.
As shown it is very easy to set up a specific submix for whatever output: select output channel, set up fader and pans of inputs and playbacks – ready! For advanced users sometimes it makes sense to work without Submix View. Example: you want to see and set up some channels of different submixes simultaneously, without the need to change between them all the time. Switch off the Submix View by a click on the green button.
You will certainly have noticed that the signal at the outputs 7/8 did not change while you were routing channel 4 to other outputs and setting different gain values for those. With all analog and most digital mixing desks, the fader setting would affect the level for every routed bus - not so for TotalMix. TotalMix allows for setting all fader values individually. Therefore the faders and the panpots jump to the appropriate (stored) setting as soon as another routing is chosen.
25.7 The Quick Access Panel This section includes additional options, further improving the handling of TotalMix. The Master buttons for Mute and Solo have already been described, they allow for group-based working with these functions. In the View section the single mixer rows can be made visible or invisible. If the inputs are not needed for a pristine playback mix, the whole upper row falls out of the picture after a click on the Input button.
Mouse: The original factory presets can be reloaded by holding down the Ctrl-key and clicking on any preset button. Alternatively the files described above can be renamed, moved to a different directory, or being deleted. Keyboard: Using Ctrl and any number between 1 and 8 (not on the numeric keypad) will load the corresponding factory default preset. The key Alt will load the user presets instead. When loading a preset file, for example 'Main Monitor AN 1_2 plus headphone mix 3_4.
25.9 The Monitor Panel The Monitor panel provides several options usually found on analog mixing desks. It offers quick access to monitoring functions which are needed all the time in typical studio work. Monitor Main Use the drop down menu to select the hardware outputs where your main monitors are connected to. Dim A click on this button will lower the volume of the Monitor Main output by an amount set up in the Preferences dialog (see below).
MIDI Controller MIDI In: Input where TotalMix receives MIDI Remote data. MIDI Out: Output where TotalMix sends MIDI Remote data. Mackie Control Options Enable Protocol Support: When disabled TM FX will only react on the Control Change commands of chapter 28.5. Enable full LCD support: Activates full Mackie Control LCD support with eight channel names and eight volume/pan values. Send Level Messages: Activates the transmission of the level meter data. Stereo Pan Law The Pan Law can be set to -6 dB, -4.
25.12 Hotkeys In many situations TotalMix can be controlled quickly and comfortably by the keyboard, making the mixer setup considerably easier and faster. The Shift-key for the fine mode for faders and panpots has already been mentioned. The Ctrl-key can do far more than changing the routing pairwise: • Clicking anywhere into the fader area with the Ctrl-key pressed, sets the fader to 0 dB. • Clicking anywhere into the pan area with the Ctrl-key pressed, sets the panorama to meaning Center.
25.13 Menu Options Always on Top: When active (checked) the TotalMix window will always be on top of the Windows desktop. Note: This function may result in problems with windows containing help text, as the TotalMix window will even be on top of those windows, so the help text isn't readable. Deactivate Screensaver: When active (checked) any activated Windows screensaver will be disabled temporarily. Ignore Position: When active, the windows size and position stored in a file or preset will not be used.
25.15 Level Meter The HDSPe AES calculates all the display values Peak, Over and RMS in hardware, in order to be capable of using them independent of the software in use, and to significantly reduce the CPU load. Tip: This feature, the Hardware Level Meter, is used by DIGICheck (see chapter 15/21) to display Peak/RMS level meters of all channels, nearly without any CPU load. The level meters integrated in TotalMix - considering their size - cannot be compared with DIGICheck.
26. TotalMix: The Matrix 26.1 Overview The mixer window of TotalMix looks and operates similar to mixing desks, as it is based on a conventional stereo design. The matrix display presents a different method of assigning and routing channels, based on a single channel or monaural design. The matrix view of the HDSP has the looks and works like a conventional patchbay, adding functionality way beyond comparable hardware and software solutions.
26.4 Advantages of the Matrix The Matrix not always replaces the mixer view, but it significantly enhances the routing capabilities and - more important - is a brilliant way to get a fast overview of all active routings. It shows you in a glance what's going on. And since the Matrix operates monaural, it is very easy to set up specific routings with specific gains.
27.2 Selection and Group-based Operation Click on the grey name label of channel 1 and 2 in TotalMix. Be sure to have channel 3's fader set to a different position and click on its label too. All three labels have changed to the colour orange, which means they are selected. Now moving any of these faders will make the other faders move too. This is called 'building a group of faders', or ganging faders, maintaining their relative position.
27.5 Recording a Subgroup (Loopback) TotalMix supports a routing of the subgroup outputs (=hardware outputs, bottom row) to the recording software. Instead of the signal at the hardware input, the signal at the hardware output is sent to the record software. This way, complete submixes can be recorded without an external loopback cable. Also the playback of a software can be recorded by another software. To activate this function, click on the grey label in the third row while holding down the Ctrl-key.
Recording a Software's playback In real world application, recording a software's output with another software will show the following problem: The record software tries to open the same playback channel as the playback software (already active), or the playback one has already opened the input channel which should be used by the record software. This problem can easily be solved.
As explained in chapter 27.5, the hardware input of channel 1 now no longer feeds the record software, but is still connected to TotalMix (and thus to the Compressor). The record software receives the signal of submix channel 1 instead – the Compressor's return path. 27.7 MS Processing The mid/side principle is a special positioning technique for microphones, which results in a mid signal on one channel and a side signal on the other channel.
28. TotalMix MIDI Remote Control 28.1 Overview TotalMix can be remote controlled via MIDI. It is compatible to the widely spread Mackie Control protocol, so TotalMix can be controlled with all hardware controllers supporting this standard. Examples are the Mackie Control, Tascam US-2400 or Behringer BCF 2000. Additionally, the stereo output faders (lowest row) which are set up as Monitor Main outputs in the Monitor panel can also be controlled by the standard Control Change Volume via MIDI channel 1.
27.3 Setup • Open the Preferences dialog (menu Options or F3). Select the MIDI Input and MIDI Output port where your controller is connected to. • When no feedback is needed (when using only standard MIDI commands instead of Mackie Control protocol) select NONE as MIDI Output. • Check Enable MIDI Control in the Options menu. 27.4 Operation The channels being under MIDI control are indicated by a colour change of the info field below the faders, black turns to yellow.
28.5 Simple MIDI Control The stereo output faders (lowest row) which are set up as Monitor Main outputs in the Monitor panel can also be controlled by the standard Control Change Volume via MIDI channel 1. With this, the main volume of the HDSPe AES is controllable from nearly any MIDI equipped hardware device. Even if you don't want to control all faders and pans, some buttons are highly desired to be available in 'hardware'.
Examples for sending MIDI strings*: - Set input 1 to 0 dB: B0 66 40 - Set input 17 to maximum attenuation: B1 66 0 - Set playback 1 to maximum: B4 66 7F - Set Output 16 to 0 dB: B8 75 40 *Note: Sending MIDI strings might require to use programmer's logic for the MIDI channel, starting with 0 for channel 1 and ending with 15 for channel 16. 28.6 Loopback Detection The Mackie Control protocol requires feedback of the received commands, back to the hardware controller.
User's Guide HDSPe AES Technical Reference User's Guide HDSPe AES © RME 63
29. Technical Specifications 29.1 Inputs AES/EBU • 8 x, transformer balanced, ground-free, according to AES3-1992 • High-sensitivity input stage (< 0.
29.3 Digital • • • • • • Clocks: Internal, AES/EBU In, Word Clock In, optional Video and LTC In Low jitter design: < 1 ns in PLL mode, all inputs Internal clock: 800 ps jitter, random spread spectrum Jitter suppression of external clocks: about 30 dB (2.4 kHz) Input PLL ensures zero dropout, even at more than 100 ns jitter Supported sample rates: 28 kHz up to 204 kHz 29.
30.2 Lock and SyncCheck Digital signals consist of a carrier and the data. If a digital signal is applied to an input, the receiver has to synchronize to the carrier clock in order to read the data correctly. To achieve this, the receiver uses a PLL (Phase Locked Loop). As soon as the receiver meets the exact frequency of the incoming signal, it is locked. This Lock state remains even with small changes of the frequency, because the PLL tracks the receiver's frequency.
30.3 Latency and Monitoring The term Zero Latency Monitoring has been introduced by RME in 1998 for the DIGI96 series of audio cards. It stands for the ability to pass-through the computer's input signal at the interface directly to the output. Since then, the idea behind has become one of the most important features of modern hard disk recording.
30.4 DS - Double Speed When activating the Double Speed mode the HDSPe AES operates at double sample rate. The internal clock 44.1 kHz turns to 88.2 kHz, 48 kHz to 96 kHz. The internal resolution is still 24 bit. Sample rates above 48 kHz were not always taken for granted, and are still not widely used because of the CD format (44.1 kHz) dominating everything. Before 1998 there were no receiver/transmitter circuits available that could receive or transmit more than 48 kHz.
30.6 SteadyClock The SteadyClock technology of the HDSPe AES guarantees an excellent performance in all clock modes. Its highly efficient jitter suppression refreshes and cleans up any clock signal, and provides it as reference clock at the word clock output. Usually a clock section consists of an analog PLL for external synchronization and several quartz oscillators for internal synchronisation. SteadyClock requires only one quartz, using a frequency not equalling digital audio.
30.7 Terminology Single Speed Sample rate range originally used in Digital Audio. Typical applications are 32 kHz (digital radio broadcast), 44.1 kHz (CD), and 48 kHz (DAT). Double Speed Doubles the original sample rate range, in order to achieve higher audio quality and improved audio processing. 64 kHz is practically never used, 88.2 kHz is quite rare in spite of certain advantages. 96 kHz is a common format. Sometimes called Double Fast.
30.8 Connector Pinouts The 25-pin D-sub connector provides all four AES inputs and outputs. The pinout uses the widely spread Tascam scheme, which is also used by Digidesign. Tascam / Digidesign: Signal D-Sub Signal D-Sub In 1/2+ 24 In 1/212 In 3/4+ 10 In 3/423 In 5/6+ 21 In 5/69 In 7/8+ 7 In 7/820 Out 1/2+ 18 Out 1/26 Out 3/4+ 4 Out 3/417 Out 5/6+ 15 Out 5/63 Out 7/8+ 1 Out 7/814 GND is connected to pins 2, 5, 8, 11, 16, 19, 22, 25. Pin 13 is not connected.
The same is true for a direct adapter cable Tascam D-sub to Euphonix D-sub. Euphonix: Signal D-Sub Signal D-Sub In 1/2+ 15 In 1/22 In 3/4+ 4 In 3/416 In 5/6+ 18 In 5/65 In 7/8+ 7 In 7/819 Out 1/2+ 21 Out 1/28 Out 3/4+ 10 Out 3/422 Out 5/6+ 24 Out 5/611 Out 7/8+ 13 Out 7/825 GND is connected to pins 3, 6, 9, 12, 14, 17, 20, 23. Pin 1 is not connected.
