Always consult the official Owners Manuals and Guides first.
Information about the FM3 may be incomplete or wrong, it's being worked on.

Multiband Compressor block

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Mbc2.jpg Multiband Compressor block.png]]

Available on which products

  • Axe-Fx III: 2 blocks
  • FM3: 1 block
  • Axe-Fx II: 2 blocks
  • AX8: no
  • FX8: no

Channels or X/Y switching

  • Axe-Fx III and FM3: 2 channels
  • Axe-Fx II: no

What is a Multiband Compressor

A multiband compressor (MBC) consists of multiple compressors working in parallel, each operating on a separate band of frequencies. Fractal Audio's Multiband Compressor blocks contains 3 compressors. These compressors work independently, so "pumping" in one band does not affect the others. An MBC is often used as a mastering tool.

More information:

Leon Todd's tutorial on applying Andy Sneap's multicompression trick to improve palm muting

Configure the Multiband Compressor

In-depth programming of the Multiband Compressor is possible, but even at default settings (placed after Amp/Cab) it's performing fine.

Leon Todd shows how to dial in the MBC for high-gain tones

Or just check factory preset "Multicomp Plexi".


Parameter Axe-Fx III / FM3
Crossover Frequency yes
Frequency Range yes
Threshold yes
Ratio yes
Attack yes
Release yes
Auto Attack/Release yes
Level yes
Detector yes
Mute yes
Knee Type yes
Crossover Slope yes