The Edit Patchlists command opens a separate program called PatchList Manager, which provides ways to control the lists of sounds that you assign to players in FreeStyle. Ideally, you want the list (or lists) of sounds for each MIDI instrument to accurately reflect the sounds that are currently available in the instrument. If they don’t, use PatchList Manager to fix the existing patch lists for the device or create new ones, if necessary. Since each MIDI keyboard, sound module, sampler, etc. handles sounds differently, you’ll find that the patch list setup for each instrument will vary.
