ST Modular – HAPHA / compact locked random voltage / 3 HP

£14.99£60.99 (exc VAT)

Hapha / compact locked random voltage / 3 HP

HAPHA is a valuable tool for enhancing the organic and enjoyable qualities of your patches. This module generates a synchronized random voltage, tied to an external clock signal, and offers the option to stabilize this voltage into a fixed sequence. It’s particularly useful for controlling filters and other sound-shaping parameters in your modular system.

Hapha is available as a pcb/panel set, full kit with SMD pre-soldered, or built module.

ST Modular website


Build Docs 


description / manual

To use it, simply connect a clock signal to the CLK input. HAPHA will then produce a random GATE signal at the upper output socket and a random CV signal at the lower output socket. You can create and lock a new sequence of voltages and gates by adjusting the LCK knob, and an LED indicator will show when a voltage change occurs.


For additional control, if you move the SER switch to the right, you can patch a control voltage into the serial input SER which will directly influence the random voltages at the outputs.


key features

  • Random Gate and CV

  • Clock Sync

  • Lock CV and Gate to a Sequence

  • External CV Input

  • Skiff friendly

  • Wrong polarity protection

specs & downloads

  • width: 4 HP

  • depth: 30 mm

  • power: 25 mA @ +12V / 18 mA @ -12V







Additional information

Weight 150 g
Dimensions 128.5 × 20 × 4 mm

Synthesiser parts/components

Product Options

Full Kit, Built Module, PCB & Panel, fader set, stand-off set, pcb, panel

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