good idea
i like the idea, and what presentation there was is decent, however, there is a lot to be desired. you need to add something other than just one piano key area to make sounds w/, and the guitar should have a totally different interface altogether. you need drums, a bass guitar, and more instruments as well. it seemed like a quick flash, but adding these things could get you a ten. also, some of the sound quality (the bells) was rather low. the art is alright, but could be better. and you need a way to be able to play more than one sound and more than one instrument at once, and make it into a full synth.
so, overall, good job, but there is so much untapped potential in this flash, i really want to see you flesh it out a lot more. hope i helped, and good luck. 4/5 7/10