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Variety Of Sound releases preFIX - Pre-mixing and Audio Alignment Tool for Windows VST

Variety Of Sound has released preFIX, a pre-mixing and audio alignment tool which typically takes place upfront the mixing process. It's available for Windows as a VST effect plug-in and it is free.

prefix.jpg preFIX provides a clever tool-set to clean-up, fix and align audio tracks (typically taken from recordings) concerning overall frequency correction, phase alignment, spatial stereo field corrections and routing. It contains a complete gate/expander solution with a dedicated and comprehensive sidechain filtering path as well.


  • Smoothest audio frequency filtering.
  • Comprehensive gate and expander audio treatments.
  • Detailed phase corrections.
  • Easy routing and stereo imaging changes.
  • Plug-in specification:
    • Win32 / VST compatible.
    • State-of-the-art digital signal processing.
    • Performance-critical parts are written in assembler.
    • Completely SSE optimized.


  • Main audio path filter:
    • Baxandall style shelving filter with pristine audio quality.
    • Smooth Butterworth high- and low-pass filter with switchable characteristics (12 and 24dB per octave).
    • Both are oversampled and match their analog model curve behavior.
  • Sidechain path EQ and filter:
    • Whole spectrum "tilt style" balancing filter with adjustable center frequency.
    • Smooth Butterworth high- and lowpass filter with switchable characteristics (12 and 24dB per octave).
    • A dedicated parametric peaking EQ.
    • Internal/external sidechain switchable.
    • Sidechain listening option.
  • Gate/Expander:
    • Adjustable threshold between -80 and +6dBFS.
    • Freely adjustable knee from hard- to soft-knee behavior up to 1:2 downward expander mode.
    • Range limiting option (floor).
    • Channel link switchable.
    • Envelope follower section with attack, hold and release control.
    • Attack timing features console style peak timings as well as two RMS modes.
    • Additional gate pre-open timing option.
  • Phase alignment:
    • Analog style step-less signal phase corrections.
    • Detailed options for adopting phase response curve regarding polarity, frequency center and width.
    • Additional digital signal delay option.
    • Phase control switchable to channel 1, 2 or both.
  • Advanced control:
    • Detailed output channel routing with six different modes.
    • Stereo image rotation option visually supported by a goniometer.
    • Output level control with special mono mode to mix in channel 1 and 2.
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