Just a thought: What happens when Otto analyzes files nowadays? My standard procedure has always been the following:
1. Fix basic tags with external program
2. Set Replay Gain with MP3Gain (old habit from the days when MC didn't do Album Gain)
3. Import to MC
Does Otto overwrite the info stored by MP3Gain? Or does MC ignore the gain set by MP3Gain (remembering that MC's values are different than MP3Gain) and use only its own setting? Remember that I've never used MCs own analyzing. I tried though, but I didn't like the volume differences between MC and MP3Gain.