im am using line 6 pod farm. when i am choosing a sound setting i cant hear the effect fine with either my guitar or microphone when recording vocals, until i start recording. then i can hear any previously recorded tracks, except the one i am recording at that time. this is especially a problem when recording vocals, because i cant hear myself in my head phones, and cant tell if im on key. i am using garage band on a mac. after i record the track it sounds fine, and i can hear it fine, just NOT during the actual recording, what do i do???