If you're trying what I think you are, i did it once.
I used a basic synth, well-rounded sound, subtle enough to blend in with the kick. I then created a MIDI track that played along with the kick, and just hit the root notes of the chords being played (an octave lower than the bass guitar).
I thought it was a great idea until I filled up the project with other instruments, and the "toned" aspect of the kick just became unnoticed. It was a waste of time, and probably will be unless your project is quite sparse.
If this isn't what you're trying to do, then ignore my tale of woe.