Which gen of MT-32 do you have?
This sounds to me like you have the old one without headphone jack, and you have CM-32L attached to the line output. I think you'll get CM-32L output louder with headphone jack.

I also connect my CM-32L with the line-out jacks in the back, it's not normal to turn the speakers all the way up to hear it... it is true that the headphone jack will have higher volume by default since it's amplified AFAIK. It might worth the shot to open the CM-32L and see if you can find any funny business going on, perhaps a bad capacitor or something

Both are connected using the R and L jacks.
The MT-32 is the old one -- no headphone jack, only the 1/4" R and L.

I guess I'd better check the caps on the CM-32L.
Thanks.

I found more information about why the volume of the CM-32L might be low at a web archive of the Quest Studios webste
https://web.archive.org/web/20140904195249/ht … hp?topic=3564.0

Cloudschatze wrote:

Here's a SysEx string that sets the Master Volume to 70:
F0 41 10 16 12 10 00 16 46 14 F7

My CM-32L obviously has lower volume than 70%, but I wonder if the low volume could have been caused by sending the CM-32L a SysEx string to set the master volume at 30% or 40%. Or would the volume have been reset the next time I played a game that used SysEx?

CM-32L does not save any settings, once power-cycled everything resets to defaults

keropi wrote:

CM-32L does not save any settings, once power-cycled everything resets to defaults

🙁
Oh well. So much for that idea then.

No obvious leakers or bulgers when I opened the case either.