If you use MP3Gain on your files, then you should disable the ReplayGain on the Sansa, as it will no longer be needed. That’s the whole point of why Miikerman brought it up, I believe.
Actually you should probably still use the Replaygain values on the Sansa. mp3gain is only capable of making changes in 1.5dB increments. It will adjust the gain losslessly by modifying the mp3 headers. Unfortunately it stores modification information in APE tags. To get the most benefit out of the RG “experience” you would want to rescan the mp3gain-modified files with foobar2000 or Media Monkey to get the difference mp3gain could not account for.
Clear as mud? :smiley: