Leave blank to keep the stored key.
Advanced: per-platform audio
Use this to send one platform a different audio mix, for example music on Twitch
and Kick but not on the YouTube copy. Leave on Default unless you have set OBS up for it.
OBS setup (Windows): close OBS, open %APPDATA%\obs-studio\user.ini, add
EnableCustomServerVodTrack=true under [General], start OBS. In Settings β Stream a
"Twitch VOD Track" box appears for custom servers: tick it and pick the OBS audio track
that has no music. Then set Twitch to "OBS stream, all audio tracks" and YouTube to
"OBS stream, 2nd audio track".
Numbers are positions in the feed, not OBS track numbers. "All audio tracks" is sent
as one multitrack stream, which Twitch reads as live + VOD audio; other platforms
cannot read it. "SRT feed" is a separate feed sent to the SRT URL (OBS Recording β
Custom Output).