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BitterSweet v3

Transient Shaper by Flux

Free Product

BitterSweet v3 - The BitterSweet Transient Designer 

Bittersweet v3 is a free software processing tool for managing audio transients. Turning the big wheel button on the sweet side, decreases the transients amplitude. On the bitter side the transients amplitude is magnified.
Bittersweet v3 is built around our latest 64-bit version 3 framework improving the processing performance dramatically. The graphic rendering in Bittersweet v3 is using a GPU-efficient 2D/3D graphic engine. The engine, introduced first in the Pure Analyzer System, is based on the OpenGL standard optimizing the audio-to-visual experience utilizing the GPU on the computer’s built in graphics card.
BitterSweet v3 also features a control for the signal to be processed. When the main position is engaged, the process affects the stereo signal. If Center is engaged, only the M signal of the internal MS matrix is processed. If stereo is selected, only the S signal from the MS matrix is processed.
Three transient detection modes can be selected. Varying periods of integration for transients can be accessed. A Link function is provided to compensate the output gain with respect to the transient processing setting.
Like all Flux:: plug-ins, it features 64 bit floating point processing, up to 8 channels and up to 8 FS (384 KHz). Center and Stereo Modes are only available in stereo processing (2 channels).
We hope you will enjoy this new tool and make your mix Bitter, or Sweet...
No dongle or registration required - 100% Freeware!


Signal Processing Features:

  • Output Gain, controlling the gain at the end of the processing
  • Bypass routes the incoming signal direct to the output for a true smooth transition between processed and clean signal

Three different transient processing modes:

  • Main, using a regular stereo signal scheme for the processing
  • Center, processing the Mid channel only, very efficient for snare and kick drums
  • Stereo, processing the Side channel only, very efficient for panned rhythmic/transient instruments

System Requirements

Processing Specifications - BitterSweet, as all Flux:: plug-ins, provide:

  • Up to 8 channels Input/Output
  • 64-bits internal floating point processing
  • Sampling rate up to 384 kHz DXD (Pyramix & Ovation MassCore/Native)**
  • Sampling rate up to 192 kHz for native (AU/VST/AAX/AAX AudioSuite)

*Not when using Center and Stereo mode, as they are M/S modes requiring stereo operation


  • All major native formats as well as AVID AAX DSP are supported


  • Windows 7 SP1, 8, 8,1 and 10 all in both 32 and 64 bits
  • VST (2.4)
  • AAX Native
  • AAX AudioSuite
  • Waves WPAPI

Mac OS X (Intel):

  • 10.7.5, 10.8.5, 10.9.5, 10.10.5 and 10.11.5 in both 32 and 64 bits
  • VST (2.4)
  • AU
  • AAX Native
  • AAX AudioSuite
  • Waves WPAPI

Please note:

  • Bittersweet v3 AAX Native & AAX AudioSuite supports 32 bit in Pro Tools 10.3.5 and 64 bit in Pro Tools 11
  • Due to AVID ProTools changing to AAX, from Version 3 (v3) RTAS for AVID ProTools is no longer supported
  • No dongle or registration is required - 100% Freeware!

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