What exact model interface do you have? What is the exact model number on the device label, or even better find a link to a photo online and post here. Your interface may or may not have a hardware monitoring mixer, which is important to know -- it sounds like it has based on your comment , but you are not describing the original "MAudio Fast Track".
This sounds exactly like the common input mode monitoring problem. What does 'toggle k' mean exactly (hopefully you are toggling ALT-K? Have you confirmed in the UI you are toggling between input only monitoring and auto input monitoring?
If that does not work create a new totally blank session with one audio track for the guitar and see if you can at least get the expected input monitoring behavior with that.
Darryl
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