detect_midi_driver
Detects whether the specified MIDI sound device is available.
Description
Detects whether the specified MIDI sound device is available. This function
must be called _before_ install_sound().
Returns the maximum number of voices that the driver can provide, or zero
if the hardware is not present.
There are two special-case return values that you should watch out for:
if this function returns -1 it is a note-stealing driver (eg. DIGMID) that
shares voices with the current digital sound driver, and if it returns
0xFFFF it is an external device like an MPU-401 where there is no way to
determine how many voices are available.
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