MATRIXSYNTH: New Synthetic Sound Labs 1620 “NURSE RATCHET” MU Module

Tuesday, March 30, 2021

New Synthetic Sound Labs 1620 “NURSE RATCHET” MU Module

"Synthetic Sound Labs has just released its new 1 MU width 1620 Nurse Ratchet module.

Nurse Ratchet is a trigger processor and generator, designed to add an organic chain of events (bursts) to your modular setup.

When activated, either manually or with an external trigger, the selected number of triggers are generated. Time Division, Distribution, Quantity, and Probability of the bursts are both manually and CV controllable.

Based on Befaco’s popular Eurorack module “Burst” Produced in collaboration with Befaco and based on their excellent Eurorack “Burst” module,

With Nurse synced to your tempo, you can create all kinds of ratcheting effects, with divisions and multiplications leading to doubles, triplets, quintuplets, and true Poly Rhythms for your modular system.

With very short time windows, Nurse can help to synthesize fast repeating transients for “hand-clap like” sounds or modern drum hits.

Working in Cycle Mode, is also an excellent master clock with tap tempo functionality, and is able to achieve non-linear distributed clocks.


• Custom trigger bursts up to 64 triggers.
• Voltage Control burst Quantity with dedicated attenuator.
• One Shot and Cycle play modes activated via manual controls or dedicated Trig
• Pingable clock input.
• Voltage Control burst Distribution, Time Division and Probability.
• Tempo and End of Cycle individual outputs for sync other modules.
The SSL 1620 is an easy-to-use ratcheting / burst with powerful features that would otherwise be difficult to create.
SSL uses quality fiberglass-epoxy printed circuit boards, precision automated robotics and meticulous hand-crafted assembly assure years of trouble-free service.
Synthetic Sound Labs has been in the analog synthesizer business since 1973. The 1620 is yet another in SSL’s growing line of new synthesizer modules. Proudly made in the USA.

Pricing is $345 US - available directly from SSL and through NoiseBug, Pomona, CA.

1620 Specifications at a glance:
Model Function
1620 Nurse Ratchet
Pulse Ratcheting / Burst Generator MU format Module
- Manual Burst Quantity encoder. Tap center to PING (sync tempo).
- Quantity Amt (External Quantity CV attenuator)
- Distribution (Manual control of burst speed "ramps" - up/equal/down)
- Time (Variable tempo division & multiplication)
- Probability (Control how often the burst is randomly inhibited)
- Trigger button (Manually initiate the burst)
- Cycle (Auto-repeat burst cycles)
Panel Indicators
- 16 Burst Quantity LEDs - Tempo, EOC & Out LEDs
- Quantity CV (0 to 5V)
- Distribution CV (0 to 5V) - Time CV (0 to 5V)
- Probability (0 to 5V)
- Trigger (~2V threshold) - Ping (~2v threshold)
- Tempo (Repeats at the set tempo)
- End-Of-Cycle (Outputs a trigger when burst cycle is complete)
- Out (Main output - This is where the fun happens)
Panel Power Size
High quality 0.062” durable aluminum with Metalphoto graphics.
- Current draw: +15V @ ? ma, -15V @ ? ma
- 6 pin Molex standard.
Width - One Moog Unit (MU) Depth - 1.5" behind panel"

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