Alarming buzzing from external Hd during playback

Hi- there's no sign of clipping when I play my project, and input levels are well down. Yet at certain points in the piece the external HD from which I'm working buzzed alarmingly.
Could the reason be 1) because it's on the external HD ?
2) Because I'e got 3 instances of Space Designer loaded:- a) with 5 EXS instruments b) with piano + 5 Jam Pack wind instruments c) with Audio (VoiceOver)
I sent all instruments using the same reverb to the same Bus.
Could I simply send all SD instruments to the same Bus even though they use different reverb settings to cut down the load ?
Any bright ideas wuldbe appreciated.
Thanks, SeaDream

Perhaps you can explain more clearly where the buzzing is. Is it on an audio track, (when you solo/mute-you hear/don't hear buzz). Is it physically coming from the hard drive?.
Does it only become apparent when you use Space designer/ or a certain patch in SP? If you just send one instrument to SP do you hear it.. If you overdrive the bus send you can get distortion.
Solo each EXS instrument - is it clean? I have noticed that if I set the volume of the EXS instrument up all the way to get decent level - there is distortion on some samples coming out. Better to set EXS volume to 70% and then use a 'gain' plug-in after to make up for volume.
I've also found that one of the EXS pianos has some distortion in the upper registers if you are playing several sustained notes.. Not always apparent. This distortion appears to be in the recording of the sample or the fact that I am holding a six note chord out in a high register. I never noticed it before until I was working on this one particular song.
It is possible to get a ground hum when using external drives, but you hear that all the time.. You are talking about an 'alarming buzz"
I'd try different reberbs and sends, keep experimenting until you isolate the cause.. If you replace Space Designer with platinum reverb is there still the buzz? If not you're starting to trace it down.
Good luck

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