My one and only recommendation for the Mach system is to delete/bypass the whole thing and run a good aftermarket HU to good aftermarket speakers and a good aftermarket amp/amps. I've avoided buying SN95s with the Mach system for years.
I know it is possible, google will likely know. Might be more trouble than its worth.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.