Hi i recently purchased a sonicport vx to record both acoustic and electric guitar,i plug my guitar into my HD500 effects unit then out to the sonicport and from there using the usb cable i go straight into the computer now my problem is when i connect my earphones to the sonic port i can only hear the guitar when recording starts or if i am practicing with guitar pro i only hear the guitar when i press play when i pause it after about ten seconds it turns off,is this normal??