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 TrapezoidSynth by Uhhyou is a Virtual Instrument Audio Plugin. It functions as a VST 3 Plugin.
Product TrapezoidSynth
Developer Uhhyou
Price (MSRP)
Type / Tags Synthesizer
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
  Download Released
  Download Released
  Download Released
Miscellaneous Information
Copy ProtectionNone
Important Note
GUI is disabled for Linux build for now.

Note: Currently Linux build doesn't display GUI due to some problem related to VSTGUI. For Linux, LV2 version is available at https://github.com/ryukau/LV2Plugins.

Note: I don't have mac so macOS build is not tested. If you find bug, please report it to https://github.com/ryukau/VSTPlugins.

TrapezoidSynth is a monophonic synthesizer equipped with two trapezoid oscillator which is piecewise function of PTR ramp function. In other words, it's just a fancy version of tri-pulse oscillator:

  • Equipped with 2 trapezoid oscillator.
  • Pitch drift with white noise for oscillator 1.
  • Slope and pulse width controls for trapezoid shape.
  • Phase modulation to oscillator 1. Feedback knob is just another phase modulation.
  • Up to 8 order low-pass filter with saturation.
  • Can be modulate filter cutoff with Oscillator 1 output.
  • 2 ADSR envelopes for output gain and filter. Filter envelope can be used to modulate oscillator pitch in octave.
  • 2 AD envelopes for various modulation.
  • Retrigger control for all envelopes.
  • 1 LFO for oscillator 1 and filter cutoff.
  • 3 types of pitch slide. Always, only when sustain, reset to 0 Hz when first note on or last note off.
  • Pitch slide time offset between oscillator 1 and 2.

LV2 version is used in demo video. Only difference between VST3 version and LV2 version is small details in GUI.

{See video at top of page}

Latest User Reviews Average user rating of 0.00 from 0 reviews


Discussion: Active
17 November 2019 at 2:48pm

There's no VST file?

20 November 2019 at 12:40am

I think I clicked wrong button and deleted the post. I'm very sorry for that.

Removed post said a file is missing in package. It's now fixed and windows binary is available.

I'll try to find a way if it's possible to revert the deletion.

1 December 2019 at 3:04am

the VST3 doesn't display in Linux however I have successfully built the VST2 which does display, as does the LV2.

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