Just wondering if this type of behaviour is similar to what you were seeing or if any of the community members might have any ideas. As this might affect the MIDI communication to the device and since I didn't see you mention anything about this: are you using a proper adapter cable (i.e. one that …

I figured out why the MPU card isn't working in my older machines. It's specifically the VLB and specific PCI machines. It's the Video card. For whatever reason, when the Video card pulls an IRQ, the MPU card won't work. BUT!!! If the BIOS allows me to disable an IRQ for the VGA card, it will work. …