Sound level variations without any command

Hello.
When using my iMac 24" 3,06 Ghz, the sound level always varies without any command.
It is very disturbing mostly because it is associated with the display of the sound level on the top of the screen.
Can you help me?
:-) Dominique

A little more background. I've now found that I can get my volume back by clicking the Device setting off of CoreAudio, and then selecting CoreAudio again. This lasts awhile then the sound drops out again. Also, I've tried different instruments in the EXPS 24, different Instrument/MIDI channels and still get the dropout prob. Even deleted the audio object in the environment and started over with a new one. All the other instruments in the track list are EXPS 24 and not affected

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