Currently Being ModeratedJan 24, 2013 12:03 PM (in response to cauchy)
You will need to either setup and separate output from your soundcard for you headphones - ie mix going outs 1&2, click routed to outs 3&4 (via the enviroment object for click) - headphones plugged/routed to 3&4 from your soundcard. Or if you don't have multiple outs on your soundcard the very basic - but easy - way to do it is to go to Preferences>Audio and uncheck "Software Monitoring" in the Core Audio page. That way you won't hear the guitar that's being recorded at all in you headphones - but you will hear anything else being played back, including the click. As you're playing acoustic you should be able to hear it perfectly well - err acoustically, if not try taking one headphone off, so you have click in one ear and guitar in the other...