Also fully understanding the difference between midi and RTs is really important. Isolate which tracks are making the sound. mute all but one and play it, then repeat until you have that track identified.

If it is all of them then it as Peter said look at either the system, or the synth.

If is is one in particular then look at the synth or the plugins that the track uses.

RTs are audio wave or WMA files those usually only have effects applied at the mixing stage. Like reverb and compression and such.

Midi is data not sound, and only becomes sound when ran thru a synth of some sort. Coyote wavetable, MSSGS, sampletank, etc. if it is the synth making the offending sound then registration could be the issue, or again system bottle neck.

really take the time to isolate the issue and then we can be of more help.

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