Regarding the sending of MIDI data when playing back a MIDI file from floppy disk or from internal memory on the Mark IIXG:
The Mark IIXG has two physical MIDI Out ports: the MIDI port and the To Host port (which is a serial port that is now obsolete). The 4-position toggle switch enables you to choose between these options. PC1, PC2, and Mac are options that apply to the serial port only.
It seems as though you have the toggle switch set correctly to MIDI.
By default, the Mark IIXG Disklavier has these MIDI output settings:
MIDI Out = KBD Out
Piano Part ESBL Out = Off
With these settings, the Disklavier only sends MIDI data out when you play the keys yourself.
If you want to play a floppy disk send the non-piano tracks to an external tone generator, you need to change the MIDI Out setting to”
MIDI Out = ESBL Out
With this setting, you could—for example—play a MIDI file from floppy disk or internal memory, mute the piano part(s) with the L and R buttons, and play the piano parts yourself while the backing tracks go to an external device.
If you want all tracks—including the piano tracks—to go to an external device, you need to make one additional setting:
Piano Part ESBL Out = On
All of the foregoing presupposes that you have connected the correct MIDI plug to the MIDI Out port. Typical USB MIDI interfaces label the plugs as MIDI In and MIDI Out. Unfortunately, there is no agreement among the manufacturers of MIDI interfaces as to whether they intend you to connect MIDI Out to MIDI Out or MIDI In to MIDI Out.
George
When playing a MIDI file on floppy disk on a Mark IIXG Disklavier, the Disklavier—by default—is set up such that only the accompaniment tracks are sent through the chosen MIDI output port. That default setting is MIDI Out = KBD Out. With that setting, MIDI data is sent only when you