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This is intended for use with Teletype 4.0's binary scale ops.
If you have a MIDI keyboard connected, you should be able to play notes and generate the appropriate bitmask for those notes.
For example, if you play a C major chord, the base 10 bitmask should show "145". You could then do something like this in Teletype:
N.BX 0 0 145; JF.NOTE N.BX 0 RND 7 V 5;This would assign the C major chord "scale" to scale index 1, and then play a random note in the chord over two octaves on Just Friends.
Note that you can get this information entirely from Teletype, as well, if you plug a MIDI keyboard into it, using a scene like this:
MIDI 2 DECIMAL DECIMAL: %1 RBINARY: R%R2 #1 L 1 MI.NL: $ 2 #2 A BSET A % MI.N 12 PRINT 1 A PRINT 2 A #3 L 1 MI.OL: $ 4 #4 A BCLR A % MI.O 12 PRINT 1 A PRINT 2 A