Run multiple instances of this scaler in different tracks of your host or DAW and synchronise the root and scale settings across all instances.
WhiteKeys mode makes playing easier and allows to use scale locked (C major / A minor) piano roll sequencers as input.

Load an instance of this script into each track and enable “Listen” and “Broadcast”.
Changes of scale, root note or preset on one instance will propagate to the others (when a note arrives).
Currently only WhiteKey and Control modes work:

WhiteKey mode is for easy playing or input from a C or Am scale locked piano roll (in GR 2).

In Control mode the notes CDEFGA switch the preset so you can use a dedicated track to sequence key changes.
Press and hold a Preset Pad to use the top knobs to set scale and root.
Tap a Preset Pad to load the preset.
Tap “Enter” to immediately activate the selected root/scale combo.

…more to come
…and thanks to Wim for Simple Scaler that inspired me to create this script.