Flux Bittersweet Pro V3

Multiband Dynamics Plugin

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  • Regular price $89.00
    Digital Product - Delivered via Email.
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Apple Silicon Compatible
AAX Native - Compatible with Pro Tools 11 and above
AudioUnits Format VST2 Format VST3 Format
Free iLok account required, USB dongle optional
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The Ultimate Frequency-dependent Transient Designer

BitterSweet Pro is built around a new improved design of the algorithm found in Flux:: acclaimed freeware transient processor: BitterSweet. One of the main features of BitterSweet Pro is its ability to process only a certain part of the frequency spectrum, providing extended control of the transients processing and making it act like a dynamic equalizer driven by Transients and/or Sustain.


  • Up to 8 channels Input/Output
  • Output Gain -24.00 dB / +24.00 dB gain range (applied to the processing output before the soft clipper)
  • Soft clipper at the very last stage of the processing path carefully rounding the edges of the clipped peaks for a smoother clipping.
  • Detector sidechain filtered in accordance with the frequency range setting and its low cut, high cut and band pass filter, the filtered sidechain extraction can be audited with a simple button click.
  • External side-chain available in AU (Mac OS X) and AAX Native & DSP (Mac OS X & Windows) only.
  • True bypass control routing the incoming signal direct to the output for a smooth transition between clean and processed signal
  • Frequency Range sets the actual frequency range to be processed (20 Hz / 20,0 kHz – Lower / 40 Hz / 20,0 kHz – Upper). The frequency extraction can be audited with a simple button click.
  • Speed, alters the mode for the processing of the transients, controlling the envelope smoothing and generating a natural attack (Fast/Medium/Slow).
  • Dynamic gain adjusting the gain of the transients and/or the sustain (-100,00% – Sweet / 100,00% – Bitter)
  • Static Gain controls the actual gain of the Frequency Range filter envelope ( -24.00 dB / +24.00 dB).
  • Geek pane (advanced settings) with an additional range of parameters providing extended control of the transient processing envelope.
  • Attack, Hold, Release, adjusting the attack, hold and release times for the transient processing.

Preset and Parameter Handling

  • Preset/Parameter slots
  • To enhance the workflow the two Preset/Parameter slots, A and B, can be loaded with two full set of parameters at the same time. Apart from saving each preset, a "Global Preset" containing both the A and B settings, and the position of the "Morphing Slider", can be saved.
  • Parameter Morphing Slider with Automation
  • The Morphing Slider provides morphing between the parameter settings of slot A/B allowing for really creative and useful real-time tweaking. Enabling the Automation control button exposes the Morphing Slider to the host automation.
  • Open Sound Control Support

Frequency-dependent Transient Processing

The Frequency Dependent Transient Processing provides the option to process only a certain part of the frequency spectrum, making BitterSweet Pro act like a dynamic equalizer driven by Transients and/or Sustain.

When Frequency Range is set from 20 Hz to 20 KHz the processing is performed on the full band, now changing the value of the low cut off frequency turns it into a High shelve dynamic EQ and setting the high cut off frequency turns it into a Low shelve dynamic EQ, when setting both, it turns it into a peak dynamic EQ.

On any case the gain can be adjusted with the Static Gain parameter, and the slope can be set with the Frequency Order parameter, from 6dB per octave to 12, 18 and 24 dB, the higher the Frequency Order is the steeper the slope of the frequency response becomes.

M/S Stereo Processing Modes

Transients and Sustain can be amplified or attenuated simultaneously or individually, and using a built in M/S Encoder/Decoder the Mid (Center) or the Side (Stereo) parts of the sound can be processed independently.

  • Main - processes using regular stereo signal scheme and it’s the only available mode for multichannel operations
  • Center - engages the internal MS encoder and processes only the Mid channel. After processing, the sound is decoded back to stereo (useful for snare/kick drums)
  • Stereo - engages the internal MS encoder and processes only the Side channel. After processing the sound is decoded back to stereo. (Efficient for panned rhythmic instruments)

System Requirements

  • MacOS 10.14 Mojave and above
  • Windows 10 and above (64-bit only)
  • Intel, AMD, or Apple Silicon CPU
  • Free iLok account and iLok License Manager
  • iLok Machine and iLok USB licensing methods are supported

Plugin Formats

AAX Native, AAX DSP, AU, VST2, and VST3