ASM1 Style State Variable Filter

Learn more about the ASM1 synth.

Thanks to Mr. Stopp for making this circuit available.

filter module front panel The front panel. Knobs from top to bottom are, input level, inverting CV scaling, resonance, and cutoff. There are banana jacks for input, CV, lowpass out, and bandpass out. On the left is part of the sine-to-pulse module.

filter from back A view from the back showing the circuit board. Pots are mounted to the board.

filter circuit board
Another view of the circuit board. Not the most efficient layout, but it works!

	The front panel. Knobs from top to bottom are, input level, inverting CV scaling, resonance, and cutoff. There are banana jacks for input, CV, lowpass out, and bandpass out. On the left is part of the sine-to-pulse module.
	A view from the back showing the circuit board. Pots are mounted to the board.
	Another view of the circuit board. Not the most efficient layout, but it works!