I see, thanks for the info. So the clone chip on the mobo does SB Pro sound effects @ IRQ 5, either in pure DOS, or inside a "Windows-based dos box". If you want SB FM music, you can only do this in a "Windows-based dos box", and then it's only emulated. That's OK, because -
* One hardware configuration option could be to have the mobo do the SB Pro sound effects (in pure DOS for example), and then you can choose what music card goes in to the single ISA slot, eg an SCC-1.
* Another option could be to use a SB clone card (eg an ESS AudioDrive) with a wavetable daughterboard, for both sound effects and music. No hanging note problems with that solution.
* Another option could be to use the mobo's gameport, and send the MIDI music information to an external synth box. I'll have to test this with games such as Police Quest 3, and Wing Commander, because I believe the music in those 2 games will not function correctly, if the MIDI interface is not Roland MPU401 compatible.