Feldspar VSTi plugin

Download: feldspar.zip

Feldspar is a VSTi software synthesizer featuring a range of tempo-based modulation options.


  • 16 LFO waveform shapes
  • 18 Ring modulator algorithms
  • Tempo-synced delay with high and low pass filters in the feedback path
  • Simulated oscillator pitch instability for vintage analog style sounds

A  short demo tune made using only sounds generated by Feldspar with no post-processing.

Extra Presets

19 banks of presets in .fxb format created by Feldspar users:

Download: feldspar-patches.zip



a VST effect plugin based on Felspar’s architecture.

Download: feldsparfx.zip

49 thoughts on “Feldspar

  1. angel bobwood

    Feldspar download seems to be unavailable and the site occasionally comes to a halt. Nevertheless, much appreciated

  2. CapDan

    Thanks for giving this away for free! Considering it’s age (and that it’s done in SynthEdit) it has some really nice sounds in it. And there are a lot of extra presets…

  3. InnerDreamer

    Very glad to see Your page again and the great Feldspar too !!! Long life to Your site !!! your Feldspar is a super synth !!!

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  8. pietdolle

    how can I get this shynt…
    I can not download this software…
    must it need support software…


  9. Jacob

    I would love to use this!! Downloaded and it does not work…no sound. any help out there would be much appreciated!

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  12. Nikolay

    Hello !

    Very much for a long time, I bought from you Feldspar.
    Now I pass on 64-bit system.
    It will work in 64-bit?

    It is a pity that it is impossible to contact you…
    Please write to me on a mail

  13. alexander

    hi contralogic,

    i love feldspar so much. can you make available a 64-bit version of it?

    please, please…

    1. Chris B Post author

      I can’t make a 64-bit version at the moment, due to it being made with Synthedit – maybe in the future it will be possible, but I don’t know how soon.

    1. Chris B Post author

      Oh wow! Thanks for the heads up.

      I’ve not been visiting KVR anywhere near as often as I used to, so I would’ve probably missed this :)

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    1. Chris B Post author

      Not easy to do at the moment, because it’s made with SynthEdit + various 3rd part modules used.

  16. taxonomiser

    I’m really enjoying this synth, but can’t seem to load any of the preset banks in LMMS – it just crashes the DAW. Any ideas?

    1. Chris B Post author

      hm.. I’ve not heard of anything like that happening before.. can you save a preset bank and load it back OK?

      Maybe some other bank manager tool can load the banks and re-save them in a format that’s compatible with LMMS?

      1. taxonomiser

        For what it’s worth, it looks like there’s a wider issue with importing .fxb files in LMMS for a range of VSTis. Hopefully it’ll be fixed in the next release. In the meantime, I’m still trying to figure out some kind of workaround…

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  19. Emre

    Hello there Chris, first of all I am really addicted to your feldspar fx plugin using it in almost all my productions. Thanks for creating a great vst. However the DAW I am using (Cubase) supports only x64 plugs now and I am really missing my feldspar. As far as I know Synthedit now supports x64 now. I would really apperciate if you can update it if it’s possible. I am ready to pay for it aswell thou. :]

    1. Chris B Post author

      Not actually sure if I’ve even got the source files any more, sadly.

      Also, although there is a 64-bit version of Synthedit, any third-party modules I used would also need to be replaced with a new version so it’s not a simple matter of just recompiling the same source in the new version of Synthedit.

    2. Chris Huelsbeck

      Can’t you wrap it with a third party bridge plugin, like jBridge? I think that actually works in Cubase 9+

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