via this auction
"The ECG is a diode ladder filter and uses 6 x red LEDs for the diodes. Diode ladder filters have a different sound to transistor ladder filters. If you’re gonna use diodes, why not use LEDs and get a free light show too? The LEDs will brighten as you turn up the cutoff of the filter, or when a CV is applied.
For maximum visual effect ECG is mounted on a translucsuent red acrylic panel. ECG is based on my Vogue VCF/VCA, the inspirations for the changes to diode ladder the Roland TB303 filter.
Features
Diode Ladder Filter
Indicator LEDs
Trasnlucent Red Acrylic Panel"
Non Re Acrylic pictured below and listed here.
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