 Further, the pedal inputs can be routed from synths like the Korg MS-20 so that external oscillators can further modulate above what's already available.Because the VCOs have separate tuning controls they tend to be slightly out of tuning phase no matter how well they're tuned; to play chords that are in direct tuning phase, play the notes in a rapid, descending order from high to low.Like most analog synthesizers, it tends to scale better from high to low than low to high.