Make sure that the following drivers are loaded in the Control Panels/Drivers section of Windows:

Timer
Midi Mapper
MCI Midi
MCI Sound

The Timer driver is the important one here but it's recommended to load the rest of them. These drivers can be found on the customer's Windows disks.

NOTE: As of 7/20/95 the Midiator serial/parallel midi interfaces are not compatible with FInale 3.0.