Resampling audio is also something that's more or less a solved problem, and going from 32 kHz which the S-SMP's DSP works at to 48 kHz is not a hard thing to do. That's unnecessary - again, snes ...
SoX is a power-packed command-line tool for various types of audio processing. It's very useful as an audio format converter, and it can be used for resampling audio files, converting between ...