gta420

I am using sonar x3, line 6 asio driver and the default windows driver for the usb mic. The problem i am having is that i cannot use my usb mic and the tone port together. When i setup my audio devices in sonar i select asio driver and it allows me to choose which input / outputs to enable however it will not allow me to select my usb microphone. Has anyone else had this problem? is their a fix? regards, gta420