OSC 2 Tune
The SYSTEM-1's second oscillator is capable of both fine and coarse detuning. The tune knob fluctuates between +1/-1 semitone, however here is a way to achieve coarse tuning capability.
Make it Coarse!
By holding down the RING and SYNC button simultaneously and turning the SCATTER TYPE dial, you can adjust the coarse tuning of the second oscillator. The UP/DOWN buttons indicate whether you are above or below the current octave. Conveniently, this setting is saved with the preset.