guitar as input device to create MIDI percussion tracks

I happen to have a guitar with a piezo pickup. Has anyone had success using Sonar (I'm on 7P) to tap out parts on a guitar, and then make Sonar perform some kind of mapping/decomposition to turn the analog track of taps into a MIDI percussion track? For example, I would like to tap the bridge (gently) where the pitch is relatively low, for a kick part, and also tap the upper bout of the instrument (where the pitch is higher) and turn that into a snare/brush track. Seems like a waste to go buy a MIDI drum pad controller box if I can figure out a way to make it happen via guitar. Any help along these lines as to where to look for this technique would be greatly appreciated....

v-vocal has audio to midi conversion. it works best for mono tracks.
give it a try and see if the results are usable. might have to input the parts separately, use some gating, audio snap, tweak v-vocal, etc.
it can be done; how well is the question.

v-vocal for S7 has audio to midi conversion? I didn't know that.

Boy...I should have voted for that other guy...

You can try the Axon or Roland guitar to MIDI products - several, like the new VG-99 have drum sounds built in. A box like the Axon 50 with something like the Roland GK3 on my strat I can use the guitar just like a MIDI keyboard to control soft synths, MIDI drums, etc...

that reminds me, sonar has had an extract timing function for quite a while. you may be able to do something with that as well.
if you want to use this long term, i'd go the midi converter route as ken suggested. midi guitar isn't perfect, but it will give you much more flexibility. personally, i'd get a guitar with a built in midi converter, but others have been happy using the add-on.

You could try playing around with this: KT Drum Trigger. Multiple detection bands, each individually tunable, and it's free too.

but why not buy a little cheap midi controller to tap? will be about 1/20th the misery of using v-vocal or anything else. damn, you can even get apps which will turn your pc keyboard into a midi controller! not a waste at all, you might even get a keyboard one and be able to put some synths in your work!

True, but you can get some pretty good grooves going rather quickly by playing drums with a pick on a guitar.
Then we go slow trying to turn that stuff into drum sounds, and probably lose the feel that the guitar had.

Or, we can go slow up front and drum with the mouse in PRV.
Or, we can go slow up front wandering aimlessly through myriads of ill-named loops, hoping one will fit.

Or wait! Actual drummers! A human being with a music education and some drums.
Don't mean to diss anybodies technique. I just like (educated) drummers. Very easy to work with.

Bad drummers will send me hunting for loops.
Good drummers will peak my performance and bring the best out of me.

I play bass in a rock band... <-- (also classically trained piano and trumpet)
There is nothing quite like laying down the foundational groove with a really good drummer.

All that said, Rev Jim's suggestion for http://frettedsynth.com/ looks pretty darn close to what you asked.

Seems like a waste to go buy a MIDI drum pad controller box if I can figure out a way to make it happen via guitar.

Its not a waste of money because its impossible to do it with your guitar and its pickups. Pickups cannot send midi data a midi controller can send midi data.
Cj