Pet Rock Rhythm Generator

Pet Rock Rogue-like Rhythm Generator

May 03, 2024 – We are pleased announce that Pet Rocks are back in stock! This new batch is being divided in three releases over the next couple of weeks. If you do not see inventory available, make sure to sign up to be notified when available!

Pet Rock Euro Rhythm Generator- Kits and Assembled Modules

While Jonah has decided to offer the Pet Rock at an extremely accessible price, you have the OPTION of paying a little extra to support him directly!

Pet Rock

Pet Rock is a rogue-like rhythm generator which changes daily, with monthly modulations in style.

This 4hp Eurorack module generates a new rhythm every night at midnight that you have 24 hours to use. Pet Rock is like rhythm Wordle - everyone who owns the module gets the exact same rhythm. No internet connected needed.

Pet Rock has 2 independently clockable (gate in, gate out) 'A' and 'B' rhythms each day, so there's flexibility in how you use it/clock it. The ‘A’ and ‘B’ rhythms can be used together as one composite rhythm, split into two separate rhythms, etc.

Rhythm generation parameters change according to the real current moon phase. The overall "Mood" changes with every 30 day moon cycle to help keep things fresh. With each “Mood” change, Pet Rock switches between several custom algorithms to produce distinct styles.


synthCube is supporting Jonah’s manifesto and principle about the economics of the module as a ‘break-even’ proposition. 

Kits come with the SMT parts pre-soldered to the PCB and the thru-hole parts in the kit for the buyer to complete. 

Assembled units come assembled and tested with mounting hardware and power cable. 

Max order is for ten units; contact us for information on larger quantities. 




Module Parameters
Panel Size4HP

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  • Brand: Jonah Senzel
  • Product Code: JSPETRCKMSTR
  • Availability: 877
  • from $5.00 TO $60.00
  • Ex Tax: $35.00

Available Options

Assembled & Tested
In stock / $35.00
Available : 114
Full Kit w/SMT Pre-Soldered
In stock / $30.00
Available : 48
XTRA $$$ Support the Maker
In stock / $5.00
Available : 169
XTRA $$$ Support the Maker +
In stock / $10.00
Available : 170
XTRA $$$ Support the Maker ++
In stock / $20.00
Available : 177
XTRA $$$ Support the Maker +++
In stock / $60.00
Available : 198

Tags: jonah senzel, pet rock, 4hp, module, eurorack, rhythm generator, modulation,