I have upgraded my firmware to the latest revision. (and replaced the I/O 
controller). The sidetone is gone. There is no option to change the source, it 
stays on U8-4 when I tap the display button.
When I put the old IC back, the sidetone returns. My K2 is an older (1644) rig 
and I don't have the 100 watt option or the the KIO2 option installed. Does 
anyone have any ideas?

Thanks, Larry
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