After further testing and getting to know the idiosyncrasies of MP3Gain, I can get it to work with the Clip+.
Loading files and clicking “track Analysis” will immediately (actually 3x slower than Foobar2000) analyze and write volume gains to the file(s). If left at this point, and the volume value is positive, the tag begins with a “+” (+0.17), which the Clip+ reads as “-48.83” - much too low to be useable. However if “Track Gain” is selected, MP3Gain writes info to the file and the Clip+ will play the song with proper volume, although the Clip+ cannot read the replaygain info - I assume because it is Apev2.
It is good to have choices - I will stick with Foobar2000
edit: should be: “although the Clip+ cannot display the replaygain info”
Message Edited by andied on 12-25-2009 12:47 PM
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.