universal ASIO driver

Low-latency ASIO audio on Windows for interfaces that never shipped a decent driver of their own — and for the ones that did, but left out what you needed. Works with 32-bit and 64-bit hosts alike. Free and open source.

Download for Windows

64-bit Windows installer, digitally signed · all releases and changelog

The KoordASIO Control window: input and output device selectors, a Shared/Exclusive rendering mode switch, and a buffer size slider.

KoordASIO Control — everything the driver needs, on one screen.

Why KoordASIO

Works with any interface

It isn't tied to specific hardware. If Windows can play through it, KoordASIO can present it to your ASIO host.

32-bit and 64-bit hosts

Both drivers are installed and registered. Older 32-bit versions of Ableton Live or Reaper, and 32-bit plugin bridges, find KoordASIO just as 64-bit hosts do — there is no build to choose.

Genuinely low latency

WASAPI Exclusive Mode with buffers down to 32 samples, going straight to the device and bypassing the Windows mixer.

No config files

Pick your devices, pick a mode, move the slider. Changes are saved the moment you make them — and a picked device that gets unplugged or renumbered falls back to the Windows default instead of breaking the driver.

Shared by default

Out of the box KoordASIO runs in Shared Mode, so a browser or video call keeps playing and any host sample rate works. Switch to Exclusive Mode when you want the device all to yourself.

Sensible about failure

When a setting cannot work — like Exclusive mode at a sample rate the device does not do — KoordASIO says so and offers the way out, instead of leaving the host with a generic error.

Open source

A derivative of FlexASIO focused on WASAPI and getting out of your way. Auditable, and free forever.

Getting started

  1. Download and run the installer. It registers the driver and sets up a working configuration for you.
  2. Open your DAW or ASIO host and choose KoordASIO as the audio device.
  3. If you need to change anything, open KoordASIO Control — from the host's "ASIO Setup" button, the Start menu, or the system tray.

Out of the box you get WASAPI Shared Mode, your Windows default recording and playback devices, and a 128-sample buffer — a configuration that works with any host at any sample rate. For the lowest possible latency, switch to Exclusive Mode in the control panel and set your host to a sample rate the device supports natively (usually 48000 Hz).

Requirements & details

Operating systemWindows Vista or later, 64-bit
Host applicationsAny ASIO host, 32-bit or 64-bit — Ableton Live, Reaper, Cubase, and others
Audio backendWindows WASAPI, Shared or Exclusive Mode
Buffer sizes32 to 2048 samples
Sample format32-bit float
Settings file.KoordASIO.toml in your user folder
LicenceOpen source — see the repository

Documentation & help

Something not working? Open an issue on the issue tracker — include your interface, your host application, and what you were doing.

For deeper reading: FAQ, audio backends (what Shared and Exclusive Mode really do), and the full configuration reference for the settings the control panel doesn't expose.