Intermittent iChat audio input problem

Hello all,
One client has an Intel Mac mini (Macmini3,1) with an external iSight camera running 10.6.7.
We can be having an audio or video conference, or a screen sharing session, and it will work fine for a long time. After a while though, for reasons that I have yet to explain, his sound input will simply change to where I can only hear him if he is shouting. When I go to the System Preferences, I can check his sound input volume and it can be turned all the way up, but he still cannot transmit any sound unless he shouts. The sound input level also jumps normally on his computer, but that sound that is making the input level jump does not get sent through iChat unless it is very loud. This will persist until he reboots the computer, at which point it will be fine again.... for a while.
The only thing I have noticed in the console are:
[0x0-0x23023].com.apple.iChat[229] resetting echo canceller
iChat[16487] attribute = {
VCSupportARDAudioMux = 1;
shouldFindExternalIP = 1;
0x0-0xcd6cd6].com.apple.iChat[16487] resetting echo canceller
Any ideas?
Router issue?
When we talk we are usually speaking on MobileMe and we have encryption enabled.....
Thanks
Message was edited by: Erich Meatleg

Hi Ralph,
In the System Preferences > Sound > Input does the blue bar seem to be alway "On" to some degree ?
No
Could this be explained by the Camera mic picking up the computer's disk noise ?
I don't think so. The Mini is pretty quiet and the iSight is on top of the monitor held in place via the magnetic holder
Does it do better on a rubberised mouse mat ?
The iSight cam?
Does the same Preferences get the Ambient Noise Reduction button even though it has no internal Mic ?
No, there is none when iSight is connected and selected
If it does try chaing it between Off and On.
Any MIDI input connected ?
sometimes, but never when we chat. a keyboard for garageband.
If so check this is at 48000 as the sample setting for the External iSight. (May may to check this anyway).
In the Audio Midi Setup right? will do that next time it is plugged in.
Will try to recreate that playlist as well.
Thanks as always...

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Intermittent iChat audio input problem

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