Route and record any audio on your Mac. SoundRelay creates virtual audio devices that capture any app, mic or system sound, and lets you wire them to outputs in a visual graph — per-line volume, live monitoring, up to 16 channels per device. Devices show up as normal mics and speakers, so Zoom, OBS and any DAW just work. Built natively on Core Audio, no kernel extensions, 100% local. Free to try, no account. A lightweight alternative to Loopback at a fraction of the price.