I used the Harmony M for a while, and for the past year have been really pleased with the Digitech VL3D with my PA500

http://www.daddys.com/detail.php?itemNumber=DIG0515

http://www.guitarcenter.com/DigiTech-VOC...ELAID=606812749

Duane
_________________________
Korg PA4x76, Korg PA600, Zoom L20 mixer/recorder, Turbosound ip500 column speaker system, Zoom B1 FOUR Bass Multi-Effects Processor