VB-Audio VoiceMeeter Overview
Voicemeeter (from VB-Audio) is a virtual audio mixer for Windows that lets you route, mix, and process audio between applications and devices in software. Acting as a virtual audio device, it can combine multiple inputs (microphones, applications, and physical devices) and send them to multiple outputs, with per-channel volume, EQ, and effects — which makes it popular with streamers, podcasters, and anyone who needs flexible audio routing, such as sending different audio mixes to a stream and to headphones. It comes in several editions (standard, Banana, Potato) with increasing channels and features, and is offered as donationware. Its full installer holds the complete application, so it sets up on a machine with no internet connection. It includes virtual cables for routing application audio, and a macro-buttons app lets you control the mix with custom shortcuts. Download VB-Audio VoiceMeeter from VB Audio's official source, linked here.