AudioSplitter

A mod that streams BeatSaber sounds to another device/channel as well.
Using NAudio (https://github.com/naudio/NAudio) Library
Currently, only ASIO is supported.
Since WASAPI cannot run on Unity, there are no plans to support it.
XAudio2 is under consideration.

Supported game versions

BeatSaber 1.34.2

Requirements

BSIPA 4.3.2
BSML (BeatSaberMarkupLanguage) 1.8.1

Latest version Download

The latest version can be downloaded from the following.
Release Page

Setting

Default Device Output

When enabled, sound is output from both the original output device and the ASIO device.
When disabled, no sound will be heard from the original output device.

ASIO Device

Please select the ASIO device you want to use.

ASIO Output Channel

Please select the ASIO output Channel you want to use.