The KETRON MS40 (from early 90's) and SD1 and X1 (from the late 90's) have 4 Audio Outputs.

The AUDYA series has 6, while the new SD9/90/60/7/40/80 have 3.

Thanks,

AJ
_________________________
[KETRON - USA]
Design Engineer & Product Specialist.
www.KetronAmerica.com