Virtual Audio I/O are THE key feature of VOICEMEETER. Virtual Audio I/O (VAIO) is a special software driver, present itself in Windows, like a hardware device – e.g. a soundcard or a speaker. This way every Windows app can “dock” to VOICEMEETER and send/receive audio signals to/from it.

The VOICEMEETER Virtual Audio I/Os support ALL possible Audio Interfaces and allow to connect any audio application, including professional audio workstations with the ASIO driver format.

Supported driver formats:

• MME:
  The MME API or the Windows Multimedia API (also known as WinMM) was the first universal and standardized Windows audio API. This audio interface type is expected to work with any audio device but with a latency time, possibly around 100 ms.
• WDM
  What we call the WDM (Windows Driver Model) audio interface in Voicemeeter is handled by WASAPI: the latest Microsoft Audio Functions to get the best audio performance and a small latency (< 30ms).
• ASIO
  Audio Stream Input/Output (ASIO) is a computer sound card driver protocol for digital audio specified by Steinberg, providing a low-latency and high fidelity interface between a software application and a computer’s sound card.
  
• KS
  Kernel Streaming or Direct Kernel streaming API allows low latency audio streaming, since Windows XP, but unfortunately not all audio devices provide this interface.
• WaveRT
  WaveRT miniport driver is supported in Windows Vista and later Windows operating systems and can offer good audio performance and a small latency (comparable to KS).
• Direct-X
  Direct-X Audio Interface is used by Video Game and some audio software. The latency is usually comparable to MME.