AMSynths Snowfall v Mirage Filters

Published on Oct 21, 2013

AM8071 SnowFall Filter
"This module is a traditional diode ladder low pass filter, similar to that in the EMS VCS3, Roland SH-3, System 100 and Practical Elctronics Minisonic 2. The filter has a 4-pole ladder with an 18dB like response, thanks to the unique characteristics of diodes..."


AM8328 The Mirage Filter
"This module is based around the CEM3328 4-pole Low Pass Filter chip that was released in 1984, as one of the last filter chips and with some great features. It has differential signal inputs, an accurate exponential scale over 14 octaves and voltage controlled resonance. It has a unqiue feature, the signal level is automatically increased as the resonance goes up, thereby avoiding the usual signal level dropping off as resonance comes in. The CEM3328 was late onto the analog stage, just before digital filters appeared, so it only made it into the BIT01 and Ensoniq Mirage (and a few drum machines). So this chip has never really seen action, and was never under analog pot control, just lonely digital paranmeter access! In the Mirage it was not even allowed to oscillate…..We just love giving it a new lease of life in a new analog module!"

http://en.wikipedia.org/wiki/CEM_and_SSM_chips_in_synthesizers