October 13, 2017


The USB-MIDI2CV adds MIDI to your analog synth or eurorack from a USB-MIDI interface. Works from any computer/phone/tablet.


  • USB-HID compliant, no drivers required
  • Volt/octave 5 octaves output for notes with pitchbend on CH1
  • Hz/volt output with pitchbend on CH2
  • 5 volt gate/S-trig output for key on/off
  • Dual drumtrigger output on CH10
  • 3.5mm jacks for CV/Gate
  • Micro-USB jack for computer/phone/tablet

Order the USB-MIDI2CV $40 including shipping

(also available at


The Breadboard-TS firmware now open-source

October 7, 2017

The Breadboard-TS firmware is now open-source and can be found in the menu to the right.

The Breadboard TS – A synth builders dream

September 15, 2017



The Breadboard TS is a development platform used to breadboard new synth ideas.


  • 830 point breadboard with built in 3 volt rails
  • 2 Octave touch keyboard
  • MIDI, CV/Gate and SQR-oscillator outputs
  • MIDI to CV/Gate input
  • 3.5mm Audio jack output
  • Built-in Oscilloscope
  • Powered by 2 AA-size 1.5v batteries
  • Measures 180x120x40mm
  • Comes with 65 jumper cables

This is the base unit only.
Synth chips can be found at:

Order the Breadboard-TS $149 including international shipping



FritzingBreadboard-TS Fritzing



3HP Zero Bassline MK-II

September 4, 2017


The Zero Bassline MK-II is a 3HP bassline synth.

Running on ghost power off the gate jack it requires no power ribbon cable.

Featuring Filter Cutoff and Filter Resonance knobs.
1V/oct Pitch CV and Gate inputs.

The Zero line is all about filling out holes and odd space in your rack.

In that case you don’t want to spend another power connector.

Zero power, zero problems, fat sound.
Look ma, no power connector!

Available as prebuilt only.

Limited introduction price this week!

Order the Zero Bassline MK-II $49 including shipping

3HP Paperface PD Oscillator

August 24, 2017

Now available as a kit or prebuilt.

Order the 3HP PD Oscillator kit $39

If you want to build it yourself it is open-source and the project is here:



3HP Paperface Camelion

August 18, 2017

The 3HP DSP Module is available now.


Demo of what a CZ-VCO can do

August 9, 2017

One really capable VCO in 3HP and a favorite demo of mine:

Order the 3HP CZ-VCO $49

The CZ-VCO is now open-source and found in the Paperface menu to the right.

The dsp-G2 available now

August 6, 2017



dsp-G2 model

3 years after the release of the popular dsp-G1 analog modelling synthesizer the dsp-G2 is now released.

The gen-2 chip has better features:

  • Fully polyphonic DCO with pitchbend and Detune
  • LFO can now modulate the DCO pitch and pulse width
  • 6dB HPF
  • 24dB LPF with Resonance
  • Filter ENV
  • Can run on MIDI Ghost power
  • SOIC-20 SMT package

The chip is available now for $30 and the carrier PCB that allows it to be built into a MIDI-DIN plug for $10.

Order the dsp-G2 synth chip $30

Order the dsp-G2 MIDI PCB $10





u808 drums is now open-source

July 20, 2017

The u808 drum chip is now open-source.

The code is available in the 3HP Paperface page to the right.

CZ1 is now open-source

July 19, 2017

The CZ1 Phase Distortion chip, used in the CZ-VCO, is now open-source.

The code is available in the 3HP Paperface page to the right.