DtBlkFx by Darrell Barrell is a freeware Fast-Fourier-Transform (FFT) based Multi effect VST plug-in for Windows and Mac.

This effect works differently to most others – instead of filtering or distorting audio data directly, it finds the frequency spectrum via a fast-fourier-transform and then does stuff to that.

DtBlkFx v1.1 features

  • Precision parametric equalizing with sharp-roll off, adjust individual harmonics of a sound.
  • Harmonic based (or comb) filtering, including active harmonic tracking.
  • Various types of noise control, change contrast between loud and soft frequencies, clip frequencies or apply sound smearing.
  • Frequency shifting, harmonic and non-harmonic shifting, including active harmonic repitch.
  • Various methods of mixing left and right channels, standard and harmonic vocoding, convolution like mixing and more.
  • Frequency masking, set harmonic or threshold masks for any effect.
  • Up to 8 effects in series.
  • GUI graphics can be customized.

DtBlkFx is available to download as a free VST effect plug-in for Windows and Mac. The download includes a manual in HTML format. You can also get a pdf version here (thanks George!)

Update: Note that Windows users can also get a 64-bit version at GitHub (thanks Dozius!).

 DtBlkFx v1.1 (Windows) — Download size: 3.00 MB
 DtBlkFx v1.1 (Mac) — Download size: 3.79 MB

The Mac version is built as universal binaries and should run on PowerPC & Intel Macs. Note that there is currently no GUI with this Mac version.

You can still download previous versions from the following posts: DtBlkFx v0.9 (Win), and DtBlkFx v1.0 (Win).