Manual
CTM64 Version 4 - User's Guide Page 7
Power supply (1)
The CTM64 does not have a built-in power supply. Instead it uses a plug-in type external power supply
(AC adapter). One reason for this feature is electrical safety. Keeping danger voltages (main) out of the
CTM64 increases the electrical safety. Therefore an external power supply of high quality and safety
should be used. If the keyboard is used in Germany the external power supply has to be VDE
approved. Another reason for the external power supply is the fact that line voltages and plug types
vary considerably from country to country. Using a plug-in external supply the CTM64 can be used any
where with a locally purchased power supply, thus keeping the retail price down.
The power supply must be able to deliver 7-12 VDC unstabilized voltage, as well as a minimum current
of 100mA. The CTM64 is switched ON by plugging the AC adapter into a wall outlet and connecting it
to the appropriate jack on the CTM64 board. There is no separate ON/OFF switch. If the polarity of the
power supply is incorrect, the CTM64 will not function. However, there is no danger of damage to the
circuitry since it is protected by a diode. The correct polarity is: outside ring = GND, inside lead =
+7...12V. The power supply is not included with the CTM64 and has to be purchased separately.
Midi Out (3)
Connect the MIDI-OUT jack with MIDI-IN of the device(s) to be controlled (i.e. Expander, Sequencer,
Synthesizer, etc. or a second CTM64) via a suitable MIDI-cable. If you want to control more than one
MIDI device you have to use daisy chain MIDI THRU/MIDI IN connection of the devices ore use a
external MIDI THRU BOX.
Midi In (2)
The CTM64 features a MIDI input. This input may be connected to another MIDI device. The incoming
MIDI data are merged to the data generated by the CTM64. At the first place the MIDI input is used for
daisy-chaining several CTM64. The MIDI input of CTM64 is not suitable for large amounts of MIDI data
(e.g. SysEx strings or MIDI messages coming from an computer sequencer) as the MIDI in buffer is
only 48 bytes. In case of large amounts of incoming MIDI messages data loss or delay may occur. If the
merge feature of the CTM64 is not required the MIDI input may be left open.
Control LED (4)
The
LED
is used to display any MIDI out activity. After power on the LED is permanently on. As soon
as a MIDI out event occurs the LED turns off for a short time thus indicating MIDI activity.
Sustain (5)
The ΒΌ" jack socket is used to connect a foot switch for the MIDI sustain function (MIDI controller #64).
Do not connect the footswitch unless the CTM64 is switched OFF. While power on the CTM64
electronics checks the level of the foot switch and assumes that this level is the "off" state. So do not
operate the foot switch while turning power on. This feature allows the use of foot switches with
contacts open at rest as well as those closed at rest. The foot switch is not included with the CTM64
and has to be ordered separately if required (e.g. the VFP2). The CTM64 will work without the foot
switch, although the function Sustain will not be available in that case.