Managed to get PC-Task MT32 working on A1200. FTDI serial driver had to be set to 38400 bauds, not 31250. Weird because Amiga Sierra games only works with 31250 baud.
Too bad that SoftMPU requires EMM, it really takes lot of performance away. TF1260 struggles with most VGA games but Circuit's Edge plays ok.
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In WinUAE just setting MIDI Out to Munt doesn't work for some reason, instead it needs to go through virtual serial ports, and then another software like Hairless MIDI has to link these ports with Munt.