Prob a simple question about synth drums...

hello... this is probably a simple question about synth drums.  

I want to make my own drum/percussion sounds using softsynths like FM8 and Absynth.   I plan on mixing and matching from different synths.  Do I need to have a different track for each drum sound (like one for the snare, one for the kick, etc...) or can I put them all in one track and have each note go to a different synth?   I was reading up on drum maps, is that what this is used for?  I would like to see my drums all in one track so I can use step sequencer, you know?   

Is this a common approach?  I can see myself having 5-10 synths just for electronic drums.

Thank You,
Adam