When using the AudioSuite version of the BF‑2A, be sure to select an auxillary side-chain input (normally the track you’re processing). The default is “None” and if you leave it set like this, there is nothing feeding the detector and you will not hear any compression action.Turn the Peak Reduction knob full counterclockwise (off) and use the Gain control to increase the signal level. Although the BF-2A does not compress the sound with these settings, it still adds its unique character to the tone.Or vice versa. Glynn Johns (who has worked with the Stones, the Who, and others) popularized the early ‘70s British trick of combining a slower compressor with a faster one. The effect can produce very interesting sounds! Try applying Peak Reduction using the BF-2A, then squash the missed attacks using the faster BF76.