Munt - distorted patch sound?

Developer's Forum for discussion of bugs, code, and other developmental aspects of the Munt Project.

Munt - distorted patch sound?

Postby a0divided » 2018-2-02 @ 02:49

This isn't that much of an issue for most people, considering Munt is primarily used for gaming and most mt-32 supported games don't trigger this problem, but the "Engl Horn" patch (and maybe a few others, didn't check) sounds very distorted on lower notes played at max velocity. At around maybe 50% velocity the patch sounds fine. I tested this using both mt32 and cm32l roms and the problem persists. Even though I don't own a real device, I'm calling this a problem with Munt specifically since some older versions (1.0.0 - 1.2.0 iirc) don't exhibit this behavior/bug.

Also, are the Atmosphere and Soundtrack patches supposed to be non-responsive to pitch bend? Not considering this a bug, just asking.
Posts: 5
Joined: 2017-9-25 @ 09:50

Re: Munt - distorted patch sound?

Postby Spikey » 2018-2-06 @ 02:46

I remember the Engl Horn in King's Quest 7 (which is not designed for MT-32) having some high volumes and velocities, and it was horrible sounding. Might have been distorted also. That was with a real MT-32, can't remember if 1st or 2nd gen.

Not sure if you have KQ7 to test, but scenes in Ooga Booga like with the Boogeyman's Crypt would be good. Although I could always find the MIDI and test it I guess!
User avatar
Posts: 220
Joined: 2003-2-04 @ 10:36
Location: South Australia

Re: Munt - distorted patch sound?

Postby Falcosoft » 2018-2-06 @ 10:11

I can also confirm this problem. It happens with notes below middle C when velocity is above 119. I recommend to report this problem in this thread:
Munt bugs reported here is usually corrected by Sergm within days.
User avatar
Posts: 516
Joined: 2016-5-21 @ 13:46
Location: Pécs, Hungary

Re: Munt - distorted patch sound?

Postby sergm » 2018-2-09 @ 17:09

I suspect, Spikey is right. There is a distortion in the LA32 ring modulator (and other places) which can be revealed like this. I added emulation of it in recent versions of the mt32emu core (see relevant commit), so no surprise it was missing in version 1.0 :)
I've just made a capture from CM-64 to double-check. Making emulation of this quirk optional doesn't sound too useful, there are patches known to exploit it. So, there is nothing to fix, IMO.
You do not have the required permissions to view the files attached to this post.
Posts: 736
Joined: 2011-2-23 @ 16:37

Return to MT-32 Development

Who is online

Users browsing this forum: No registered users and 2 guests