Synthetic Sound Labs 1015 Low Pass Gate

Posted on June 5, 2025June 5, 2025 by admin

The SSL 1015 Lowpass Gate is a modern take on the classic “Vactrol” VCA/VCF concept, inspired by Don Buchla’s iconic 292C module. Depending on the selected mode, it functions as a VCA, a 2-pole lowpass filter, or a combination of both—renowned for delivering warm, natural-sounding plucks and percussive textures. In filter mode, the 1015 introduces a distinctive resonance feedback circuit that opens up a wide range of sonic possibilities, from tightly controlled percussion to untamed oscillations.

Unlike earlier designs that relied on cadmium-sulfide (CdS) photocells—now restricted in the EU and other regions—the SSL 1015 pioneers an environmentally conscious approach. It utilizes an innovative Vactrol alternative that eliminates CdS materials, offering a future-friendly solution embraced by users worldwide.

For users in the USA who prefer the classic CdS character, a special edition with original CdS components is available by direct request for an additional cost.

🔧 Specifications:

Feature	Function
Controls	– OFFSET: Initial VCA / VCF level – RESONANCE: Filter feedback amount (Filter mode only) – CV AMT: FM Input with Inverting Level Control
Switches	– MODE: Amp: Voltage Controlled Amplifier with fast on time and natural release Both: Classic ‘Lowpass Gate’ Setting. Combination VCF and VCA Filter: Resonant Voltage Controlled Lowpass Filter
Inputs	– IN: Audio Input – CV: FM Input with Inverting Level Control
Outputs	– OUT: Audio Output
Power	+15V at 10ma, -15V at 20ma, Synthesizers.com (DOTCOM) 6 pin MTA standard.
Size	Width – One Moog Unit (MU) – 2.125″ W x 8.75″ H Depth – 1.25″ behind panel