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Simple version:Convert your WAV files to FLAC. Its lossless like WAV, but much more efficient.Do not convert any WMA, MP3, AAC or Ogg files.Rip your new CDs or any CDs you decide to rerip into a well supported lossy format, MP3 or Ogg would be good choices.
I think the issue with wavpack is more to do with trying to play the combined lossy and correction file on Rockbox since it would mean opening two files for playback. The lossy file by itself should play fine.
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