via this auction
via http://alt-mode.com/
Formant Filter
"The serial number on this module is 7505.
The Variable Formant Filter has 3 bands of variable width, frequency, and level for sculpting sounds. The module works great and has seen light use over the past 6 years in a smoke-free home studio.
This module was originally housed in a wooden box with a simple power supply. I had Synthesis Technology MOTM power connectors added for use in my system but it can easily be switched for any +/-15V supply.
These modules were part of Martin Newcomb's Museum of Synthesizer Technology in the 1990s. They are shown on page 78 of his wonderful book on the museum and can be seen in the following You-Tube video at around 2:00. This is an opportunity to own a truly unique part of synthesizer history!" [see this post for the video. see Part 1]
Dual Ring Modulator
"This is an extremely rare Polyfusion Modular Dual Ring Modulator module from 1975. When Polyfusion started, they made these modules to fit into a Moog modular system before they had developed their own format. This module, along with the other ones I'm auctioning off, are likely the only modules of this type known to exist! The serial number on this module is 7503.
The Ring Modulator consists of two circuits that multiply the X and Y inputs together, producing a tone that is the sum and difference of the two inputs. The module works great and has seen light use over the past 6 years in a smoke-free home studio.
This module was originally housed in a wooden box with a simple power supply. I had Synthesis Technology MOTM power connectors added for use in my system but it can easily be switched for any +/-15V supply."
Dual Sample-Hold
"The serial number on this module is 7506.
The Dual Sample-Hold consists of two sample & hold circuits that will retain the incoming voltage whenever the manual trigger button is pushed or the clock input goes high. Along with the sampled output voltage, the module outputs a Moog S-Trigger signal making it a quick V-trig to S-trig converter. The scale knob sets the range of the output with respect to the signal input. The module works great and has seen light use over the past 6 years in a smoke-free home studio."
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