The 4HP dspX Platform

April 30, 2018


The dspX is a 4HP programmable DSP module.

It can be whatever you program it to do.
Oscillator, Synthesizer, Drums, MIDI to CV in/out.

  • 2 CV inputs with attenuators
  • 1 Gate/trig/USB input
  • 1 DC coupled output
  • USB input for programming or MIDI control

USB requires a special cable for plugging into INPUT 3 jack.


The USB-MIDI interface is class compliant and requires no drivers.
Supports Windows, iOS and Android.

The back of the PCB has a DSP port for expansion of the capabilities.

The module stores the last program in non-volatile memory and works as standalone module.

The module is delivered with the Solina string synth software preinstalled.
Monophonic with CV/Gate or Polyphonic played over USB-MIDI.

Available at the Webshop for $99.


Awarded Top-40 Synthesizer Blogs

April 20, 2018


DIY Synthesizers was awarded as one of the top 40 synthesizers blogs 2018 by Feedspot

We celebrate this by giving you 30% off on the cart value at

(use coupon code “TOP40” when checking out. Valid one time per customer.)

DIY USB2DIN Sync adapter cable

April 18, 2018

How to build a cable that sync your Roland drum machine to your DAW.


Read more …

New blog

April 16, 2018

This blog is moving to own servers at

The move will take some time to finish so this page is still active.



rtpMIDI on the ESP8266 drum player

April 11, 2018

rtpMIDI or Apple MIDI is now supported on the ESP909 drum machine.

Over at the ESP8266 Audio hacking section.

Audio hacking with the ESP8266

Please consider a donation

April 10, 2018

I have spent countless of hours on writing and generously sharing my code on this page.

I know people think free is good and so do I.

But please consider a small donation through Donorbox.
It will keep me sharing code and having it open source.

Thank you.

A simple 909 drum synth

April 4, 2018

A simple 909 drum sample player has been added to the ESP8266 Audio hacking section.

Audio hacking with the ESP8266


Guess whats up next?

April 3, 2018




Grand opening discount

March 29, 2018

Grand opening discount at

Use the coupon code “opening2018” to give you 15% off on the cart value.

(The code only works one time per user and is valid until 31st of March)


DSP Synth Webshop Go Alive!

March 26, 2018

The webshop is now active and you find it here: