A Sampler maps a pad to each MIDI note, so scale filtering left out-of-scale
pads greyed-out and unreachable. When the punch-in / audition keyboard's channel
routes to a bus with a Sampler instrument, bypass the scale filter and enable all
twelve keys; otherwise scale filtering is unchanged. Non-destructive - the
project's scale/root setting is untouched, and switching the channel back to a
synth/SF2 restores filtering.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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