This is a how-to guide for getting good quality MIDI in Dark Forces.
Step 1
Download and install VirtualMidiSynth.
Step 2
Download and install CoolSoft
Step 3
Download a good soundfont. I recommend Arachno SoundFont which sounds great with Dark Forces and TIE Fighter music.
Step 4
Open VirtualMidiSynth. Click on (+) to add a soundfont, then navigate to the folder with your soundfont and open it. Make sure the soundfont you have selected is enabled (green light).