I'll also add another related feature that would be attractive Live Play would be a "hold" setting. Input notes would be held even after their Note Off message is received. Once you release the chord (i.e. all Note Offs received) Arp is ready and waiting for the next Note On to begin the next chord. This is similar to common synth Hold behaviors (including arps) but I don't think it's available in Live Play mode.

Yes, a more flexible CC assignment and management system would be most excellent! But definitely sounds like it would take some doing. Fortunately sustain pedal convention in midi is pretty universal so I think your proposal of recognizing hard coded CC64 is great. Thank you so much for listening!

Both options definitely seem workable to me. Agreed that #2 feels a bit cleaner. Thank you for looking at this! On a side note -- I do wonder if the current Key Split behavior is actually intentional... The manual's description for the behavior of Key Split is exactly what I'm trying to do. The manual says: "This setting lets you specify the MIDI Note, above or below which keyboard notes will be ignored for note sync and live play but will pass through to your sound generating device. This enables you to “split” an external MIDI keyboard such that one hand can set the chord for ARP and the other hand can, for example, play a melody or bassline that does not affect ARP’s MIDI Input notes." Currently if I turn key split on it does not pass through the notes that are ignored for note sync and live play. This may be a bug? This is the current behavior when Midi Thru is OFF. If I turn Midi Thru ON now it passes all notes through including those being used for note sync and live play.

Here's one! https://www.youtube.com/watch?v=5RB7-T9oP7w&ab_channel=StephenMcLeod

Yes, normally I keep MIDI Thru OFF to play ARP, although I can see why Thru ON has it's uses Specifically I would like to use keyboard split to play ARP on one side and normal non-arpeggiated notes on the other. For example playing bass notes with my left hand under an arpeggio on my right, or playing a melody with my right hand over a lower arp/sequence. Currently this can only be done by handling all the key splitting and note filtering externally outside ARP. It looks like this might be implemented in ARP as an additional "split" MIDI Thru mode where the filtered notes (the ones not contributing to the ARP chord notes) are allowed through unchanged.

You were right, it was the time division! I've now changed it from 1/16 to 1/8 and can get 4 chop notes. Thank you.

Ah ha! That makes sense now. The manual is missing this setting from the Global Settings section so I didn't understand its purpose. Thanks for the help!