Wubforge is a basic wave editor for the GP32.

This version of Wubforge can perform copy/paste, delete, mute or reverse operations on the whole or a section of a wav file. 8/16-bit, stereo/mono, 11025, 22,050 and 44100 Khz, uncompressed wavs are supported.

http://www.nesis.net/wublog/wublog.php?jumpto=gp32