Discrete OTA VCF
The text below is from the description page for the MOTM-440 Discrete OTA Voltage-Controlled Lowpass Filter with VC Resonance. The E440 is an euro version of this module. While not all features between the two are the same, I thought some of the basic features and history of the module would be of interest. http://www.synthtech.com/motm440.html
"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?
So order a MOTM-440 filter for a fraction of the price of a P5 Rev. 2, but without the worry of obsolete parts!"
No info about availability.$300 submitted Oct 13th 2012, 08:32 by H_wig | last Change Jan 30th 2016, 14:10 by transmission23