How to change audio track on a flv-video during streaming?

Hello ,
I would like to stream a flv-video, but every time with
different audio-track.
So how can I change the audio track on a video-stream? Is
there any server-side solution for this?
I used to stream the audio on different stream - parallel
with the video stream -, but because of synchronization problems,
it didn't work.
Any idea?
Thanks

Thanks for the helpful response. I'll check out the the options available for shaping the sound with eq, efx and amp sims as you suggest.
It still would be helpful to know if I change an audio track (.aif file) into a midi track in GarageBand or in some other software so I can change the instrumentation of the track from piano to another instrument.
Thanks again!

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