To use it with Crispy, you'll need to install VirtualMIDISynth, load the soundfont you want, and set the Default MIDI Out Device to VirtualMIDISynth #1 in the MIDI Mapper panel. I have MIDIMapper installed and control it with VMS, but I'd also refrain from installing it unless VMS doesn't switch outputs properly. If you want to go back to using Microsoft's default synth with VMS still installed, and VMS doesn't use what you selected for some reason, you can also install MIDIMapper by the same company, and they will both work for selecting your preferred MIDI output. Still, I use it for everything, even to simply map what output device to use for MIDI. The simplest way I can think of is to use VirtualMIDISynth, though it does change the way your whole system's MIDI output works until you uninstall it as far as I know.
