Conceptually based on the DivKid/Instruo Ochd (but with four LFOs instead of eight–get it?), Forked is a free-roaming modulation workhorse, with triangle and square outputs. One rate knob sets the general speed for each LFO, all of which run independently and asynchronously from one another. Triangle out provides ample modulation opportunities, while square out can act as a gate signal for self-patching or triggering other modules. Patch a clock into the hard Sync input to reset each LFO in time with a gate pulse to create modulations that start in time with the clock, but don’t run in time with the clock.

It’s called Forked because it has four LFOs, but you can expand it to six for Sexed or 12 for Dodecahexed. You’re only limited by HP space and your patience.


Schematics are provided as-is. Never trust that any schematic on the internet is foolproof. Test your build in isolation before introducing it to the rest of your modules.


Rate Control

  • Resistors
    • 1.8k (1) R3
    • 47k (1) R2
    • 100k (1) R1
    • 470k (1) R4
  • Potentiometers
    • 100k (2) RV1, RV2
  • Transistors
    • 2N3906 (2) Q1, Q2
  • Audio jacks (1) J1

LFO Core (Multiply quantity by total number of LFO cores desired)

  • Resistors
    • 1k (5) R5, R6, R7, R8, R12
    • 2.2k (1) R14
    • 2.7k (1) R13
    • 10k (1) R11
    • 100k (2) R9, R10
    • 22ok (1) R — oops
  • Capacitors
    • Value varies (1) C1*
  • ICs
    • LM13700 (0.5) U1
    • TL074 (0.5) U2
  • Audio jacks (2) J2, J3
  • LED (1) D1

*Choose a different value capacitor for each LFO core to achieve different LFO speeds. Individual tastes and preferences will vary. Recommendations include 47nf, 100nf, .47uf, 1uf


Coming in the future.