Here's what I've figured out so far using these two fantastic plugins together, as AU MIDI FX in Logic, with Scaler providing the input chords and K (EDIT=Kameleono) in Flow/Arpeggiator Mode, running patterns, as in the factory template for Logic, and in this screen grab (any Arp choice):

…they seem to work very well, and pretty much consistently, with S in front, followed by K.
When Scaler is set as in these screen grabs (all with Bind MIDI hi-lit), it auto-runs with no input, but can be adjusted with input from keys:
Top row, any song or progression selected:

Middle row with Chord Variations hi-lit:

When Scaler is set as in this screen grab (with Bind MIDI hi-lit), it runs only with key input:
Bottom row when Play is not clicked or is finished playing:

When Scaler is set as in this screen grab (with Bind MIDI hi-lit), it sometimes runs only with key input and sometimes auto-runs; switching between various settings can eventually clear the auto-running:
Middle row with Diatonic Chords and Voicings selected:

Middle, Diatonic Chords, no Voicings chosen, seems to also be reliably non-auto-running.
Loving K in every other way I've figured out how to use it, too; amazing, deep device for sure, and will be thrilled to see more tutorials ASAP:)
TIA!