while i dont use sonar.... i have a pretty basic possible cause... are you turning off the metronome during playback? lol... may sound silly but you never know...

i use cubase and i have never had it record its own metronome under any circumstance.. but its triggered the second you hit play or record..

No way buddy... There would have to be a metronome in the signal chain or in the pod for that to happen. Like the other guy said solo the track and you wont hear the metronome unless you have left it on during playback. The only other way is you have a mic armed for recording while you recorded your pod and the mic is picking up the sound of the metronome and putting it on a track, that would explain why it sounds so quiet.

My guess is you have just left the click track running while you started playback. You'll need to mute it when your not tracking. Make sure you only have your guitar track your trying to record armed when you are tracking so your not picking up unwanted s**t and with other instruments on your interface, lastely make sure you dont have any tracks hidden in your DAW that were left armed. I have done this numerous times.