well.. from a question of what part did I make.. the answer would be all....
from the standpoint of what part did I play.. the answer would be none.
This song was done a long time ago when I was using a program called Acid Pro 2 (now Acid Pro 4)... I actually made some (3) of the demo songs for Acid Pro 3, but I don't use Acid at all anymore. Acid was(is) a loop based / sample based program where I'd use sample libraries and chop loops up rearranging them...etc. to make a song. Basically I'd start with these little 4-bar loops of individual sounds, and then I'd screw with them one by one (with about 30 going simultaneously together) to make the song. Very time-consuming, and very limiting to creativity (needless to say it's a pain in the rear).
Since this song I've upgraded to a REAL studio where I actually can PLAY the instruments (synthesizers) myself and record into a Pro-tools type program. I find this much more enjoyable.. and I have much more control.
So anyways, to answer your question.. if the mouse is considered an instrument... then all.. if not.. then none.