Flash Multitrack Audio Player?

when you are recording or mixing a band in multi track, you have the bass drum in its own track, the snare drum in its own track, the lead vocal in its own track... etc.So my idea is this. I want to make a Flash player that can reproduce 5.1 mp3 files through a regular stereo set and let the user be able to mute specific tracks on the go.

Why this? Becouse I won't use them as a regular 5.1 audio, which its function is to hear audio in surround sound. In this case, I will use each track to put a different instrument, so in one you have the drums, in other the bass, in other the guitar, in other vocals and in other keyboards.

He can for example mute the drums, or hear only the voice... etc.It would be even better if the flash interface can look as a mixer and that each track has its own mute and solo button, and a fader to controll the volume of that particular track.