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ASIO4ALL v2

Universal ASIO Driver For WDM Audio

- Instruction Manual -

Last reviewed: 08/15/08

Table of Contents

Introduction........................................................................................................................................................1

Getting Started................................................................................................................................................... 2

Setting up your audio software......................................................................................................................2

Basic Configuration.......................................................................................................................................3

Advanced Configuration.................................................................................................................................... 5

Common Usage Cases Optimizations................................................................................................................8

Using “ReWuschel”...........................................................................................................................................9

Troubleshooting............................................................................................................................................... 10

Introduction

Welcome to ASIO4ALL v2! This manual enables you to make the most of your ASIO4ALL installation,

especially as it comes to the advanced features newly introduced in this Version of ASIO4ALL.

In order to achieve the best possible results with ASIO4ALL, it is recommended that your computer is

configured accordingly:

● Set the power scheme to “Always On” (XP) or “High Performance” (Vista) in order to turn off

Processor P-State switching! Advanced: Modify an existing power scheme so as to not switch CPU

speed, because other power settings are not that critical.

● Turn off system sounds! While e.g. the Windows logon sound certainly will not be a problem,

sound effects in response to button clicks, notifications etc. will mean that for the time they play,

ASIO4ALL may be unable to initialize the audio device.

For updates, help and further information, please visit:

http://www.asio4all.com/ - ASIO4ALL Web site

http://mtippach.proboards40.com/ - Support forum

Summary of content (11 pages)

PAGE 1
ASIO4ALL v2 Universal ASIO Driver For WDM Audio - Instruction Manual Last reviewed: 08/15/08 Table of Contents Introduction........................................................................................................................................................1 Getting Started................................................................................................................................................... 2 Setting up your audio software.......................................
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Getting Started Setting up your audio software In order to make use of ASIO4ALL, you need to configure your audio software accordingly. How you would do this depends on your particular software application. Generally, you would always enter the audio configuration menu and select ASIO -> ASIO4ALL v2. There now should be a button to launch the ASIO control panel. How this button is labeled depends on your particular software. Once you press this button, the ASIO4ALL control panel should appear.
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Basic Configuration Illustration 1: Basic Control Panel View 1. Device List This is the list of WDM audio devices found in your system. Highlight the device that you want to make changes to. Note: All parameter changes always only apply to the currently highlighted device! Activate the device you want to use by clicking on the button next to the device name! In the picture above, the High Definition Audio Device would be enabled while all others are not.
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2. ASIO Buffer Size Use the slider to adjust the ASIO buffer size for the device currently highlighted. Smaller buffer size means lower latency. Once you hear crackles or audio becomes distorted, you need to increase the buffer size. ASIO buffer size directly relates to audio latency. Thus, you want to get a rather small value here. 3. Load Default Settings Pressing this button will reset all configuration options to their initial defaults.
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Advanced Configuration Illustration 2: Advanced Control Panel View Once the control panel has been switched to advanced mode, things begin to look a little more complicated. You will have noticed that the items in the device list are now expandable. By expanding the device list, you can now fully explore the WDM audio architecture of your system. The device list contains Devices, Device Interfaces and so called “Pins” (this is Microsoft(r) lingo).
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. Hardware Buffer on/off Note: For WaveRT drivers (Vista), this box is labeled “Allow “Allow Pull Mode (WaveRT)” (WaveRT)” instead! Enables the hardware buffer for the highlighted device. This only works for so called “WavePCI” miniports, as other types of WDM drivers do not usually allow direct access to the hardware buffer. Adjustment for best hardware buffer performance involves the “ASIO Buffer Size” slider and the “Buffer Offset” slider (see below).
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8. Always Resample 44.1<->48 kHz ASIO4ALL can do real time resampling of 44.1 kHz audio to/from 48 kHz. Resampling will automatically take place whenever ASIO4ALL is opened for 44.1 kHz and the WDM driver does not support this sample rate. There may, however, be instances in which case an AC97 will support 44.1 kHz by resampling internally. More often than not, however, AC97 resampling quality is extremely poor and/or prone to stability issues. To work around this, you can enable this option.
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Common Usage Cases Optimizations • Playing Software Synths Live In this scenario, you do not need audio inputs. Therefore, you best disable them all, which normally will provide you with a better stability at very small ASIO buffer sizes, or allow smaller buffer sizes in the first place. Further, you should also disable all audio outputs you do not really need.
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Using “ReWuschel” If you selected the ReWuschel install option, the audio inputs ASIO4ALL provides to your host application are now also accessible as ReWire inputs. This makes sense for applications that only allow for ASIO output, but support ReWire. One such application is Reason. Now, in order to get real-time audio input in Reason, you need to make sure that ASIO4ALL v2 is the current ASIO driver.
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Troubleshooting Since ASIO4ALL presents itself to the audio software as a single ASIO driver, but due to its various configuration options, can act like a chameleon, there are numerous things that can go wrong without ASIO4ALL being at fault. Most notably, if you change the device setup in the ASIO4ALL control panel, the number of available input and output channels is likely to change, as well as the names of the channels that are seen by the host application.
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• The latencies displayed in e.g. Cubase SX 3 do not match the values that would result from the ASIO buffer size. ASIO4ALL supports the latency compensation features of ASIO hosts that perform latency compensation. This support is still a bit under development and will be improved as time passes. The values reported here are not just the latencies ASIO4ALL adds to the audio stream, but rather the represent the whole of driver/OS/hardware inherent latencies. If the guess was correct, that is...