MATRIXSYNTH: Synthetic Sound Labs - Geo-Grüvn and Lowpass Gate


Sunday, June 15, 2025

Synthetic Sound Labs - Geo-Grüvn and Lowpass Gate


video upload by NOISEBUG

"Two new releases from Synthetic Sound Labs that happen to play very well together. The SSL-1015 Lowpass Gate and, the Model 1655 - Geo-GrüVN
Add some Euclidean variation and snappy west coast percussive melodies to your 5U/MU systems. Head to noisebug for more info
#umodular #synth #modularsynth #synthesizer

https://www.noisebug.net/collections/..."



The 1655 Geo-Gruvn is a six channel, 16 step Euclidean rhythm / gate sequencer for Synthesizers.com modular synths in only 1 MU.

Geo-Gruvn is inspired by the brilliant efforts of Japanese designer Hagiwo, and produced by SSL with kind permission. SSL has also significantly enhanced the hardware and software leading to better performance and improved functionality.

Each of the six output channels allow adjustment of:

Hits – The number of outputs generated, with Euclidean spacing.
Offset – Changes the starting point for the Euclidean sequence.
Length – The number of steps for this channel before resetting.
Mute – Turns on/off all outputs of the selected channel.

A single rotary encoder allows uncomplicated selection of channels and functions with simple visual feedback provided by a bright color LCD display.

The Geo-Gruvn features clock and reset inputs, 6 gate / trigger outputs with standard ¼” phone jacks and associated LED panel indicators. An easy-to-use Pattern Memory screen provides non-volatile storage for up to 8 pattern sequences.

In addition to its extensive Clock / Sequencing related duties, Geo-Gruvn can respond to Clock inputs well into the audio range, making it a convenient 6-channel frequency divider. All outputs follow clock input pulse-width.

Power is supplied by standard Synthesizers.com power header.

Quality, solder masked, fiberglass-epoxy printed circuit boards and meticulous hand-crafted assembly assure years of trouble-free service.



The SSL 1015 Lowpass Gate is a modern “Vactrol” VCA / VCF module inspired by Don Buchla’s original 292C. Depending on the selected mode, a lowpass gate can act as a VCA, 2-pole lowpass filter, or VCA/VCF combination which is well known for creating organic plucky sounds. When in filter mode, the 1015 adds a unique resonance feedback which allows a variety of controlled percussive sounds and wild oscillations.

Previous lowpass gate designs used cadmium-sulfide photocells (CdS) which are currently banned in the EU and possibly several other nations. The SSL 1015 may be one of the first to utilize a Vactrol design that replaces the CdS photocells with a newer technology – helping protect our environment and is therefore welcomed Worldwide.

An option for the CdS version is available at additional charge by direct factory request for USA based shipments only.

The SSL 1015 Lowpass Gate is a modern “Vactrol” VCA / VCF module inspired by Don Buchla’s original 292C. Depending on the selected mode, a lowpass gate can act as a VCA, 2-pole lowpass filter, or VCA/VCF combination which is well known for creating organic plucky sounds. When in filter mode, the 1015 adds a unique resonance feedback which allows a variety of controlled percussive sounds and wild oscillations.

Previous lowpass gate designs used cadmium-sulfide photocells (CdS) which are currently banned in the EU and possibly several other nations. The SSL 1015 may be one of the first to utilize a Vactrol design that replaces the CdS photocells with a newer technology – helping protect our environment and is therefore welcomed Worldwide.

An option for the CdS version is available at additional charge by direct factory request for USA based shipments only.

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