Audio check tool that lets streamers compare their output volume against advertisement volume
Audio volume can be a huge headache to tweak, because there are so many moving parts involved-- (in-game audio settings, capture settings, mic settings, etc) and what the streamer hears isn't always what viewers hear. Streaming software displays your audio levels in real time, but not everybody understands what this means for your actual output.
This leads to some streams having good mic/game balance but being whisper-quiet without realizing, or streams where the streamer KNOWS an adjustment is needed, but gets mixed feedback from viewers about how much to change. It also means a lot of trial and error for streamers who are committed to getting it right (and have to go through the process again every time they swap out a piece of equipment or play a new game).
Since advertisement volume is locked in and can't be adjusted by the streamer, it would be a good standard for comparison with streamer's adjustable output levels. I think it would be extremely helpful to have a Twitch-based tool that lets streamers briefly simulate stream (like a "broadcaster-only" version of "subscriber-only" streams), to capture up to a Clip's worth of test footage and compare against a standardized sample at the same volume that advertisements play (Note that I'm not asking for Twitch-side gain controls; actual settings would still need to be adjusted within the same software & hardware that they are now).
Simply doing a live-test in the current system isn't optimal due to the potential effect on analytics, not to mention viewers with Notifications enabled receiving a ping (or connected services posting announcements on Twitter or Discord, etc).