KDB - Kick Da Bass Try it, it's free !
This combinator acts as a filter to your bass and allows you to lower the volume of this bass using the audio signal of a kick drum, like a sidechained compressor, but only for low frequencies and with no compression. So this lets pass "high frequencies" of your bass without any modification.
This will let pass the low frequencies of your kick drum over your bass while preserving high frequencies of your bass.
VBS - Volume Band Splitter Try it, it's free !
This combinator allows you to split audio signal in 3 bands : a low band with the low part (in volume) of audio, a high band with the high part (in volume, so the louder part), and a mid band that contains the rest of signal.
A second version is also available with only 2 bands.