Tajna92,
I have the Triton-Rack and I can confirm what Stam and Kbrkr have stated that you cannot create auto-accompanyment that changes with the chords you play. All you can do is create arpeggios tied to the Internal or External MIDI clock.
As Mdorantes mentioned the easiest workaround is to add a Korg PA60. The Triton voices will blend in perfectly. You could also add a Tyros Le (a.k.a. PSR3000) to your Triton Le. In addition to rhythms and styles you would get an extra palette of new Yamaha sounds to layer with.
Tapas
[This message has been edited by Tapas (edited 12-12-2004).]