Yes, you can use your tascam CD GT1 with your amplifier. Connect the LINE OUT of your player to AUX IN of your guitar amplifier. You will need a STEREO MINI PHONO to RCA adaptor/extender. But be careful -- the signal is going to by-pass the volume control of your amplifier, so it will be LOUD. Turn down the volume control of your player before your do anything! And see page 8 of your player's manual for a picture!