Com 2 problem..

Hello all,
HAve some problem getting my Com 2 to work.
When i start up my sim i choose PMDG 737-700. Com 1 and nav 1-2 and adf 1-2 works fine. but..
using the com2 i can select the frequesies, but cannot hear anything. If i choose default 737 i can hear, and when switching back to PMDG afterwards, then i also can hear, but need to do this procedure verytime.
The radios are cockpitsonic. Tried to change the devices, let com 2 become com 1 and vice versa.. same results, so the radios are working fine.
Aircraft.cfg looks fine to me as well.

Any ideas to make it work as it should, or am I missing something here?

Hi

Have you pushed the selection switch on the back of the comm panel its a blue switch with a white slider I did this and it worked fine.

Chris