(Libretro/Retroarch) MIDI doesn't start until fullscreen toggle

[phly95]

Edit: seems this problem happens with other cores. DOSbox also has this problem when testing doom.

On Windows 10 using Retroarch/Libretro, I started Touhou 2: Story of Eastern Wonderland, and when switching from FM music to MIDI music, it stays silent, though toggling fullscreen with F gets the MIDI started (with incorrect instruments since the song started from the middle, which is fixed by starting a new song) Also, the problem comes back when you die and are booted to the main menu.

I currently have Sound Canvas VA installed and am using loopMIDI, SAVIhost, and MIDIMapper Configurator based partially on Phil's Computer Lab Sound Canvas instructions https://www.youtube.com/watch?v=WumRboSfn90 (except the MIDImapper part), though I'm not sure this has anything to do with my issue.

[DukeSkinny]

I can confirm the same problem over here. Although, I was surprised to see your partial solution as I didn't think MIDI worked at all! Games like Harlem Blade & Appareden, which support GS MIDI, all exhibit this problem & will go silent again once you return to the menu.