device list classification misc?

[mckayshirou]

in the file https://github.com/markc/alsa/blob/master/lib/md/Aconnect.md#example-sblive-soundcard

it said that 0..63: for internal use (0 = system, 63 = OSS sequencer emulation)
64..127: device drivers (up to 8 for each card), i connect my keyboard midi piano and seems does not fit with such example list

root@venenux-shirou:/var/www/html# aconnect -lio
client 0: 'System' [type=kernel]
    0 'Timer           '
    1 'Announce        '
client 14: 'Midi Through' [type=kernel]
    0 'Midi Through Port-0'
client 24: 'CASIO USB-MIDI' [type=kernel,card=2]
    0 'CASIO USB-MIDI MIDI 1'
root@venenux-shirou:/var/www/html# 

more about the configured devices for me at https://t.me/open_tecnologies/1460?comment=90196