Meet the Turn Up Volume Mixer: a handy tool that allows you to easily control your music, games, and streaming software. It has 5 knobs that you can program. There are also buttons to pause media, set up macros, mute button, and switch input/output device.
This gadget has animated light effects. Its knobs can be used to control input/output volume, program/system and active window volume. It works with OBS studio.