dkdsp

I've put together, on request, a program to convert the standard mono DSP files
created by the devkit DSPADPCM.exe into stereo (either by doubling a mono file 
or using one mono file for each channel) files for Donkey Konga or 
Star Fox Assault. It's been tested on a Gamecube with Japanese Donkey Konga 2.

Notice that the point of this program is to generate new DSP files for use in
Donkey Konga. It is not necessary to combine right and left channel DSPs for 
playback with in_dsp or in_cube, if you choose either it will load the other as
well.