I own a roland Micro cube Bass-RX. And don't get me wrong, that thing is SMALL and impressive, it even fits in my college bag - But is ther anything smaller? I am looking for something that I can put in my bag and forget it's there. Must battery powered. The ride to the college is a Boring 45 Mins long, and we all have electric instruments, Playing them acousticly FAILS bad - I'm limited to slap bass and teh others have to play rediculously hard Does such a thing exist or is this a job for the soldering iron and some electronics hacking?