Watch any small streamer's VOD and you'll see it: the mid-stream audio fiddle. Riding gain between game segments, re-selecting the mic after a crash, apologizing for the hour where the levels were wrong. The problem usually isn't the gear — it's a chain with too many hand-tuned links, each of which drifts.
Order the chain right once
A voice chain that holds up is boring and ordered: placement → gain staging → processing → routing, tuned in that order, because each stage can only polish what the previous one delivered.
Placement decides your direct-to-room ratio; nothing later can fix a mic that's too far away (the numbers are here). Gain should be set so your loud voice — the raid-hype voice, not the reading-chat voice — peaks with headroom to spare; streamers set gain on calm speech and then clip every exciting moment for the rest of the night. Processing in OBS: a gentle high-pass, one compressor doing a few dB of work, a limiter as a seatbelt. If any filter is working hard, the problem is upstream. Routing last, and as simply as possible — every virtual cable and monitor loop you add is one more thing to silently break at 2 a.m.
The two failure modes that force babysitting
Drift: you move, the distance changes, the carefully-staged gain is now wrong. Long streams make this worse — nobody holds one posture for four hours, and energy changes posture. This is why compressors on streams end up over-cranked: they're being asked to fix a distance problem, which they do by pumping up room noise every time you lean back.
Device roulette: a USB hiccup, a reconnected interface, or macOS quietly re-picking inputs (the reset mystery, explained) and OBS is capturing the wrong mic or none. You find out from chat.
Coverage beats discipline, on stream too
Both failure modes have the same durable fix that call setups use: stop depending on one physical mic staying at one distance. With a desk mic for keyboard position and a second mic (or lav) covering lean-back and standing range, SoundMesh keeps your voice on whichever mic hears it best and feeds OBS one stable virtual microphone. Your gain staging stays valid because your effective mic distance stops swinging; a dead USB mic no longer means silence, because the handoff just stops choosing it. One mic live at a time, so there's no phasey dual-mic sound (why summing two mics backfires) — and Loopback still slots in after it happily if you're routing game and music audio into the mix.
The goal state for stream audio is that you stop thinking about it: chain ordered once, gain staged for your loud voice, coverage instead of posture discipline. Set it up on an off night, put SoundMesh in front of OBS, and spend the next stream playing the game instead of the mixer.