Two-line delay, cross-feedback, LFO modulated clock
Big knob is wet/dry control. Two bottom knobs are for feedback amount and base time of delay. Middle knobs control modulation speed and amount. Slider switch on right selects modulation shape. Slider switch on left adjusts offset for modulation amount - the first position is normal, on other positions clock frequency can go to 0, etc...
Three outputs - main or separate lines (named R and L).