Your best bet for cheap but still effective is the Lighting FX box. It is a basic controller that you can use to sync up lights to blink and flicker along with the music or sound effects. Under $20 - sometimes you can even find them for $12 if you're lucky.
We're discussing creating a lightening effect in the above thread, but it can work with light strings and music, whatever as long as you have it near the sound source or plugged in directly (and it's super easy to figure out).
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