Overview

What started as a bedroom project in early 2003 – for the sole purpose to get ASIO support for the AC97 on my laptop – has become ASIO4ALL – the universal ASIO driver for WDM audio. Honestly, I did not expect this project to become as popular as it has become (but this popularity would not particularly disappoint me, either 😉

ASIO4ALL is a hardware independent low latency ASIO driver for WDM audio devices. It uses WDM Kernel-Streaming and sometimes even more sophisticated methods to achieve its objectives.

In order to use ASIO4ALL, you need:

  • A WDM-compatible operating system, (any Windows OS since Win98SE)
  • A WDM-driver for your audio hardware, whereas all audio device drivers are WDM drivers, except sometimes under Win98SE/WinME.
  • A couple minutes of your time and a little bit of luck.

What ASIO4ALL will NOT do:

  • Replace your existing sound card drivers or mess with them in any way.
  • Install any kernel mode components that could potentially affect the stability of your system.
  • “Overclock”, or otherwise operate your audio hardware in ways that could potentially be harmful and/or void your warranty, except, of course, in cases where the manufacturer of your hardware has specifically stated that the use of ASIO4ALL would void your warranty indeed.

ASIO4ALL is free for the end user. Commercial exploitation (resale/bundling…), however, is restricted.

ASIO is a trademark of Steinberg Media Technologies GmbH.  All other trademarks are the property of their respective owners, used for product identification purposes only.

  • Kernel Buffers/Buffer Offset

    Kernel Buffers/Buffer Offset

    If hardware buffering is disabled, this control lets you add up to two more buffers to be queued for audio output. Each additional buffer increases the output latency of the device by the time it takes to play one buffer. Therefore, the initial setting of “2” should only be changed on less powerful machines, where…

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  • Allow Pull Mode (WaveRT)

    Allow Pull Mode (WaveRT)

    Note: These controls have no effect for WaveRT packet devices. Packet devices do not support polling – and always will use event mode. Therefore, the entire “Options” section may be hidden for packet devices. This is not a bug! There are two basic access methods for a WaveRT device, “pull-mode” (also called “event-mode”) and “push-mode”…

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  • Always Resample 44.1<->48 kHz

    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 audio device will support 44.1 kHz only by resampling internally. More…

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