- controls the cutoff frequency
- controls the resonance
- controls how much FM1 influences the filter cutoff frequency
- controls how much FM2 influences the filter cutoff frequency
- In 1
- controls the level of input 1
- In 2
- controls the level of input 2
- In 3
- controls the level of input 3
- Bass (Normal/Enhance)
- in Enhance mode, the module adds a second audio feedback path to boost bass response at higher Q levels.
You have probably heard of the SSM2040 filter chip, used in the Prophet 5 Rev. 2 synth, the Voyetra 8, and others. Although short-lived, the SSM2040 filter had a unique sound different from a Moog, ARP or other 4-pole lowpass. Why? The design used a clever discrete OTA gain cell.
The MOTM-440 offers an updated SSM2040 architecture using matched NPN/PNP pairs and features a switch that adds a second audio feedback path to boost bass response at higher Q levels. This makes the filter "growl and rumble" even more! In addition, voltage-controlled Q allows for more sweeping effects. Three audio inputs and three CV inputs make the MOTM-440 the killer lowpass filter in your system. The internal gain structure is such that over-driving the filter is now possible (unlike the Prophet 5) to get even more nasty sounds. Did we mention it self-oscillates at high Q?