Can someone clarify the MIDI & MT-32 tab options?

The_cranky_hermit · Post by **The_cranky_hermit** » Sat Jun 06, 2015 8:03 pm

I am more or less familiar with how MIDI works. I know the difference between Adlib, MT-32, and GM. But I am confused about the ScummVM MIDI & MT-32 options tabs. Specifically, what do "GM Device" and "MT-32 Device" actually do? There's already a "Preferred Device" option on the Audio tab, and its function seems to be "send the music data to this device." I can pick my GM soft synth, my MT-32 (via MIDISPORT Uno), or the AdLib emulator. Given that, I can't deduce the point of those other two options.

Longcat · Post by **Longcat** » Sun Jun 07, 2015 9:10 am

Prefered device is set in global option(you can set a prefered music device for all your games). Or you can select a device under each specific games options.

The_cranky_hermit · Post by **The_cranky_hermit** » Sun Jun 07, 2015 1:42 pm

These are all global options. You can set "GM Device" and "MT-32 Device" independently of "Preferred Device." But I don't understand what this accomplishes.

Raziel · Post by **Raziel** » Sun Jun 07, 2015 3:31 pm

The team is well aware of the limitations in the specific audio/MIDI tabs.

They've even worded a GSOC task idea to address that problem...alas there hasn't been anyone commiting to it yet

The_cranky_hermit · Post by **The_cranky_hermit** » Mon Jun 08, 2015 12:32 am

From playing around, I don't think these settings do anything at all!

From what I can tell, [Audio]->[Preferred Device] and [MT-32]->[True Roland MT-32] are responsible for the entire MIDI rendering path. Take Day of the Tentacle, a game with AdLib, MT-32 MIDI, and GM. If [Preferred Device] isn't a Windows MIDI option, I hear AdLib music. If it is a Windows MIDI option, then [True Roland MT-32] setting determines whether DOTT uses the MT-32 music or the GM music, and [Preferred Device] determines which device I hear it on.

[MIDI]->[GM Device] does nothing at all - no matter what I set it to, I will hear GM on the device selected on the audio tab, if and only if [True Roland MT-32] is disabled.

[MT-32]->[MT-32 Device] also does nothing at all. I will hear my MT-32 proper if and only if it's been selected on the Audio tab.

Or is it up to the game engine to interpret these settings, and not core ScummVM?

MusicallyInspired · Post by **MusicallyInspired** » Tue Jun 09, 2015 3:30 pm

I assumed they were to set for ScummVM to treat the MIDI device it's using as an actual GM device/MT-32 device without taking shortcuts to make it sound like a GM device/MT-32 device.