hmmm i dont know if anyone said it till now
but learning arrpegios or whatever it spelled is really important to jazz playing... i dont know if you know what arrpegios are but basicly the idea is to take some chord and to play its notes one by one
for example C7
the notes of the chord are:
C E G Bb ,so you just have to play those notes like:

----------
----------
----------
---------8-
---7--10---
-8--------
offcorse when playing jazz you should use more "complicated chords but the idea is the same.. to do this right and good you should practice this technique on clean sound, and also to learn all the theory how the chords are build