I already written about side-chain compression, so here’s a tip how to use it in a more subtle – yet effective – way: separate the bass in low, mid and high frequencies and then have the kick drum trigger the compression only on the low end of the bass.
- Make three copies of the bass (or create parallel channels).
- Isolate the bass in three frequency ranges; low 20-160 Hz, mid 105-950 Hz and high 550 Hz-7 kHz. It’s okay overlap some.
- It’s possible to pan the high and the mid slightly wider, but keep the low end in mono.
- Now side-chain only the channel with the low frequencies by -6 dB or so.
By doing this, the low end of the kick will be audible whilst the overtones of the bass will be kept intact.