The voltage controlled filter is the prime method of filtering the harmonics of the input audio signals. The M²Synth has a number of filter choices:

• VC LPF 110 A low pass filter (attenuates higher frequency harmonics) with a 3-channel input mixer. Width 2U.
• VC LPF 116 A mini version of the low pass filter 110 without the 3-channel mixer. Width 1U.
• VC HPF 111 A high pass filter (attenuates lower frequency while passing higher frequency harmonics). Width 1U.
• VC BPF 113 A band pass filter that attenuates frequencies above and below the centre frequency passing only a narrow band of frequencies). Width 1U.
• VC BRF 114 A band reject (notch) that attenuates a narrow band of frequencies while passing frequencies above and below the centre frequency - opposite of the band pass filter. Width 1U.
• VC APF 115 A filter that passes all frequencies but varies the phase of the input signal at different frequencies in a non-linear way. Width 1U.
• VC SVF 112 A state variable filter that is 4 filters in 1 LPF, HPF, BPF & APF that can be used in combination of series / parallel for complex filtering effects.

Overview 

The voltage controlled 24dB/octave 4-pole low pass filter is the default filter for your synth. The 110 is a full size 2U wide module with a 3-channel signal mixer making it ideal for mixing the waveforms from up to three VCOs for that fat sound. Filter 116 is similar but without the mixer allowing it to fit into a 1U wide module.

Features 

• 3-Channel input signal mixer
• 1 Volt / Octave cut-off frequency CV (2 off)
• Cut-off modulation input with potentiometer attenuator (FM3)
• Resonance potentiometer control with an external CV resonance input
• Self-oscillates with high resonance settings of >70%

Specification

• Supply voltage +/-12Vdc
• Supply current  +13mA / -16mA
• Waveform levels +/-5V
• Frequency range: 19Hz to 15kHz without any CV applied
• Main PCB dimensions 87.5x130mm

Kit contents

Each kit contains

• Main PCB
• Jack socket PCB
• All electronics components, IC sockets and power socket
• 100mm long Power lead 
• Potentiometers, knobs and jack sockets
• Front panel assembly (faceplate and 3mm aluminium back panel)
• Fixings