I have a TASCAM CD-BT1 and use it quite often. I am experiencing a problem that I can not resolve. There seems to be a continual chorus effect even when I have the EFFECTS = OFF. I miss the clean sound I was getting when I first purchased it. I am ready to send it back for a waranty fix but thought I would post the issue here fiirst to see if I was missing something. Has anyone experienced the same problem?