Multiband compressor with side-chaining broken?

Perhaps I’m misunderstanding how side-chaining with the multiband compressor should work, but it seems that with side-chaining active that both the direct and side signal affects the compressor. I would expect that just the side signal would affect the compressor.

Reproduction steps:

  1. Create two instrument tracks.
  2. Insert a “MultibandCompressor” on instrument 1 and activate side-chaining on it.
  3. Send the signal from instrument 2 to the “MultibandCompressor” (via the Sends strip).
  4. Mute instrument 2 and trigger audio on instrument 1.
    Note that the “MultibandCompressor” still responds to the signal from instrument 1. Shouldn’t it only respond to the audio from instrument 2? The regular/non-multiband “Compressor” appears to behave correctly.

A friend also tried this with Fabfilter Pro’s multiband compressor and had the same results.

I’m using Windows 7 64 bit & Cubase 8.0.20 32 bit.


I’m having the same issue. Am I just misunderstanding something or is there something wrong?