The FMR Audio PBC-6A ("PBC" for "Professional Balanced Compressor") is a mono compressor/limiter in the same 1/3-rack size as the wildly popular Really Nice Compressor and Really Nice Leveling Amplifier. This vintage-inspired unit features an adjustable knee, going from smooth and gentle compression to aggressive dynamic stomping at the twist of a single dial, as well as a "Thick" mode for a release curve that subtly beefs up the sound.