Yamaha DTXpress/DTXplorer/DTXtreme

Recently I bought a "imic" (a little USB device that act as a sound
card) for my ibook 
and I recorded some songs with my DTXpress I. 
 
Here you have one of them: 
 
http://drjoo.ath.cx/personal/coses/night.ogg 
 
I know, i know... but I'm a beginner.