Dennis,
The iCom has three mono inputs but no stereo in.
The stereo in should go through your intercom.
Click on the picture below to see how I connected mine:

__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html