Tuesday, 16 June 2015

XSRDO Doppler Modular System
Download the current version of Doppler Modular System
VSTi Plugin for Windows

XSRDO Patchwork Modular System

Unlike some VSTi synthesizers which claim to be modular but are in fact, really just simple fixed synthesizers where the modulation matrix has been replaced by fancy graphic lines drawn across the screen...

XSRDO Patchwork Modular System is a true modular synthesizer.
You can choose what modules you want, where to put them and how many of them you want. Each module is independent of any other and only becomes active when you start to patch them together in your own creative way.

Simply point and click on a virtual rack header to insert, delete or move a module or click on the XSRDO patchwork modular System title for more options.

New Vintage Modular Skin

36 virtual racks
80+ virtual modules
Insert any module into any rack
Insert multiple modules
Movable modules
Load & Save preset programs
Fully user skinnable including three alternate skin examples
Many example patches included
Choice of label font sizes
Quick access on module help option
Comprehensive help manual included
XSRDO Wavetable Maker program included

Typical system requirements
Microsoft Windows 7+ Operating system
Intel core CPU 
1 GB Ram 
12MB for the VSTi 
Optional 20MB+ for the system files (waveforms, wavetables, samples etc...) 
1920 x 1080 resolution display monitor

Including free wavetable maker



  1. No download link? I use Arturia Modular V and your synth (vsti) is the only one that I use along. Best free modular synth software on the web...

  2. Sorry, v091.1 should fix a bug in the previous version.

  3. Well done, Kirsty. Great synth.

  4. Updated to v1.01
    Now with over 60 modules. Some of the new one's are...

    MIDI CV-Gate
    LFO MS10

  5. Great work, Kristi! Thumbs up!
    I've been witing for ages to see a good free vst modular synth like yours.
    If I would put something on my christmas wishlist it would be like more types of filters and more control parameters for the filters, for instance resonance control...
    Merry christmas & happy new year!

  6. I'm just going to keep this simple. Thank you Kirsty, thank you so much. XSRDO works perfectly in Tracktion5 (32). I keep a 32 bit version running as well as a 64 bit version as well. My main synth is Zebra 2 from U-He but XSRDO is a fantastic vintage modular. I'm 62 years old and I grew up with Tomita and Walter/Wendy Carlos. I never thought then I would download a computer file that would contain the entire definition of a top end modular synthesizer. And for free as well! Thank you for all your hard work. Composing old school Electronica is my retirement and it's because of people like you that make it possible.

    All the best,


    Btw, the output is a bit low in Tracktion5 but I just add a second volume plugin maxed for a 6db boost and it takes care of it. But making it a bit hotter would help.

    1. Thanks for the kind words Paul.
      Enjoy the synth.



  7. Kirsty, Could You tell me how to force sample player to loop? :) Cant switch on a diode to be lighted (v.1.08). Btw. its amazing synth, Im really impressed by your skills :) Greetings from Poland!

  8. Hi
    You found a bug! treat yourself to an ice cream :)
    V1.091 Replaces the broken LED with a switch to turn sample
    looping On/Off.

    Regards Kirsty

  9. I will :) You are amazing! thx a lot!

  10. Hello Kirsty
    Thank you for this nice piece of work.
    We use it on Linux 18 on Carla pluginhost and it loads fantastic, its cpu use is acceptable and sounds great and looks great.
    Now we want to use midicontroller automation using a DAW (Qtractor) and record an automationtrack as for all of our other synths, but i don´t see how.
    Is it possible?

    Regards Harry

    1. Hi Harry
      Have you tried using a MIDI_CC module (available from the MIDI menu). It converts MIDI controllers (16-19) data, to values that can be patched anywhere.

      Regards Kirsty

  11. Congratulations for such a great work! I'm really impressed with the latest builds but there's still one important thing wrong: oscillators are inactive unless there's MIDI note data coming in, this is not what happens in a real (modular) oscillator, you patch it to the output and there it is, just generating an audio signal constantly (you have to insert a VCA to control the level). I mean, the way it is XSRDO now, it is not possible to make non-stop droning patches. Do not take this comment badly, your synth is awesome, I only wish it to be the closer as possible to a real modular, that's it. :)

    1. Hi Wallyaudio

      Thank you for your comments.
      Doppler is designed to 'throttle back' the audio engine when MIDI note data is no longer relevant to save some CPU.
      It can indeed work as you suggest. I will enable this type of operation in the next update and allow the current CPU saving method as an menu option.

      Regards Kirsty

  12. Thank you so much for this synth and all the hard work. I really enjoy it!

  13. Hi, I like your software. :D
    Are there some plans for including a MIDI-Learn function ?
    For using them as standalone with Savihost.

  14. Hi Herby
    Yes Midi learn is on my TODO list

    Regards Kirsty