Flux Bittersweet Pro V3

Multiband Dynamics Plugin

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    In most cases, the product you purchase from us is a serial number/license code/activation code to register the product with the manufacturer and download directly from them. This ensures you receive the latest version of products, and the best support when necessary.

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    For detailed instructions on the registration/download process, you can visit our dedicated page by clicking here: Install Instructions.

Education Proof

Products with education pricing are for students & teachers only. To prove your education status we require that you upload proof in the form of an image/PDF.

Types of proof


Student ID Card, Letter of enrollment, or similar


Teacher ID Card, Lecturer ID Card, Payslip, Letter from the school/college

Education proof is submitted to the manufacturer and is accepted at their discretion.

The Basics

iLok is a copy protection method used by many of our brands.

It has 3 types of activations, iLok USB, iLok Machine, and iLok Cloud.

Different brands/products will offer different iLok methods. iLok USB is always an option, but the availability of iLok Cloud and iLok Machine methods is at the discretion of the software developer.

iLok Account

For all iLok protected products, you will need an iLok account. You can create one for free here: ilok.com/#!registration

iLok License Manager

To manage your iLok licenses, there is a dedicated app called iLok License Manager. This app is used to register, activate, and move your licenses between locations.

You can download the latest installers from the iLok website: ilok.com/#!home

iLok USB Key

iLok USB

This activation is stored on an iLok 2 or 3 USB key.

It is the best option for portability, if you frequently move between multiple machines, and offline use.

iLok Machine ID

Machine ID

This activation is stored locally on your computer.

While this is a convenient way to work offline, and does not require the additional cost of an iLok USB, there is the risk of a license being lost in the case of a drive failure.

This option also requires extra care when you upgrade to a new computer, the license(s) must be deactivated on your old machine first to ensure you do not lose them.

iLok Cloud

iLok Cloud

This activation is based online, and requires a "cloud session" using the iLok License Manager.

It requires an active internet connection for the entire time you use the plugin(s).

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

Crossgrade Proof

This crossgrade is for owners of a competing DAW. To prove your DAW ownership, we require that you upload proof in the form of an image/PDF.

Types of proof

A copy of your purchase receipt for the original license or the most recent update/upgrade

A screenshot of your product registration

A photo of your package (either CD/DVD or printed manual), with the unique serial number included in the photo.