Bastl Instruments KASTLE v1.5 Manual page 4

There are 3 more modes on the secondary OSC output:
phase distortion, tonal noise mode and formant synthesis.
Each mode utilizes one or two oscillators.
The PITCH parameter controls the main oscillator, the
TIMBRE sets the PITCH of the modulating oscillator and
the WAVESHAPE depends on the synthesis mode.
The voltage controllable LFO has a triangle and square
output and a reset input.
The stepped waveform generator is inspired by the Rungler
circuit by Rob Hordijk. It can produce 8 di erent voltages
either in random order or in 8 or 16 step looping patterns
depending on how the BIT IN is patched.