I recently purchased a used Ensoniq MR61. All the sounds seem to work fine, except when I go into sequencer mode, when some of the sounds either stop working (no sound when keys are pressed), or only play at a very low volume. Two further observations about my problem: most of the sounds that stop working are bass-type sounds, and it never happens to the General Midi sounds. Can anyone point me in the right direction on how to fix this? Any help would be greatly appreciated.

Also, does anyone know where I can find a downloadable pdf MR61 manual? I found manuals for the MR Rack and the ZR76, but no MR61.

FWIW, that's a pretty specialized question, and is better off reposted in the Keyboard forum above. If someone is familiar with the unit/problem, that's where they'll be. This is a pretty low traffic forum. Good luck.

Best, Paul