Waves C1 sidechaining.

(in Cubase)

1. Create a stereo group chanel. Call it Sidechain.

2. Route your bass noise and your kick noise to the group channel.

3. Pan your bass hard left, and your kick hard right.

4. Add a Waves-C1-sc to the group channel as an insert effect.

5. Change the sidechain mode to L --> R.

Bingo.

You'll have to bounce your results down to a mono file.