The 68A Matrix filter is based on the filters of the Matrix 12 and Expander synths of the 80's. While not a direct clone this design uses modern components in place of the CEM custom ICs used in the original. The filter responses and sound are faithful to the classic design. The 16 filters are divided into two banks with selection from the front panel via BANK toggle switch. Each of the 8 filters in a bank is provided with a separate output for external mixing and cross fading down-line.

  • Module Highlights:
  • 16 Filter responses
  • Separate out for each bank of 8 filters
  • 2 x CV and 1V/OCT control of frequency
  • 16Hz-20kHz range
  • CV Resonance
  • very low distortion/noise design
  • excellent temperature stability and tracking
  • Self Oscillation in Bank L filters.

  • Filter Responses:

  • Bank L
  • 4 Pole Lowpass
  • 2 Pole Lowpass
  • 2 Pole Bandpass
  • 2 Pole Highpass + 1 Pole Lowpass
  • 3 Pole Highpass + 1 Pole Lowpass
  • 4 Pole Bandpass
  • 2 Pole Notch + 1 Pole Lowpass
  • 3 Pole AllPass + 1 Pole Lowpass

  • Bank R
  • 3 Pole Lowpass
  • 1 Pole Lowpass
  • 1 Pole Highpass
  • 2 Pole Highpass
  • 3 Pole Highpass
  • 2 Pole Highpass + 1 Pole Lowpass
  • 2 Pole Notch
  • 3 Pole AllPass

Specs:
16Hz-20kHz range
Output: 1Kohms
Input: typical 5V pk-pk@100Kohms
Input CV: 5V @100Kohms
Power: +15V @35mA, -15V @35mA

Demo MP3s:

2 pole High pass
3 pole All Pass
4 pole Low pass
4 pole Band pass
3 pole High pass
2 pole Band pass
2 pole Band pass2