Comment 29 for bug 1509557

For this first implementation I'm not going to address the questions of combining the replaygain and track gain UI elements. I think that could get confusing very quickly. So to start, I think it's sufficient to just support the direct editing of the saved ReplayGain value. I don't think it's realistic to "solve this bug" by somehow fixing replaygain so it's never ever wrong :). Mixxx has always been a combination of auto-detection and user tweaks. We should allow the greatest flexibility for users, and sometimes that means tweaking a value manually.