ScaleLock sits between your keyboard and the instrument and fixes notes outside the scale. Nearest snaps to the closest note in the key, Up and Down always go one way, Block mutes wrong notes, and White Keys lays the chosen scale out on the white keys — you play F# minor as if it were C. Scale Shift moves the melody by scale degrees (e.g. +2 = a third up, without leaving the key), Transpose by semitones. Humanize adds small timing offsets and velocity differences so quantised parts don't sound machine-made. The key wheel and history show what you played and what it was corrected to, and the keyboard marks the notes of the scale. Everything you play is captured — drag it onto a track as .mid. Works with the MIDI output and with the built-in sound.