More silly fun:

You midi guys would know all of this stuff, but I just discovered the virtual midi piano keyboard (vmpk) and it's pretty cool if you don't have a real midi keyboard handy.

./mame64 apple2p -sl2 midi -verbose -flop1 ../../Passport\ designs\ -\ Master\ tracks\ v1.8.dsk -snapsize 560x384 -debug -midiout "VMPK Input" -midiin "VMPK Output" -log

I also installed fluidsynth for linux so I can get some midi sounds too.

Now I get a bunch more items when I listmidi:

Code
./mame64 apple2e -listmidi

MIDI input ports:
Midi Through Port-0 (default)
Portable Grand MIDI 1 
VMPK Output 

MIDI output ports:
Midi Through Port-0 (default)
Portable Grand MIDI 1 
Synth input port (20027:0) 
VMPK Input 
qjackctl

./mame64 apple2p -sl2 midi -verbose -flop1 ../../Passport\ designs\ -\ Master\ tracks\ v1.8.dsk -snapsize 560x384 -debug -midiin "Virtual Keyboard" -log -midiout "Synth input port (20027:0)"

On ubuntu, just "sudo apt install vmpk fluidsynth" and get a soundfont2 from the net (I got the General User one)

[Linked Image from i.imgur.com]