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"AM8109 JP8 VCF Summary
This module is replication of the Low Pass Filter from the legendary Roland Jupiter 8 and 4.
This is a 2 and 4 pole OTA design that Roland first used in the Jupiter 4 in 1980, replacing a discrete version of the filter which took up more PCB space.
This is a warm sounding filter with smooth frequency control and a resonance that gradually increases up to full self oscillation, a sound very reminiscent of the early 1980's. The difference between 2 and 4-pole modes is not dramatic, with the 2-pole mode providing a more gradual cutoff slope and silky sound.
EuroRack Module: 14HP wide
Detailed Description
This module is an accurate reprodution of the Jupiter 8 low pass voltage controlled filter, using the original IR3109 OTA chip in the filter core. The design has been updated to use modern components (such as OTA capacitors and high quality Op Amps). It delivers a very warm and smooth sound.
There are front panel controls for adjusting the Cutoff Frequency and Resonance as well as the level of 2x control voltages and 3x audio signal inputs. Resonance is smooth and controllableto self-oscillation.
There are six 3.5mm jack sockets on the right of the front panel;
•Audio Signal output
•2x control voltages
•3x audio inputs.
The slope of the filter can be switched between 2 and 4 poles using a small red push button, and a red LED with lens shows the filter slope selected."
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