Hi Nobby,
the pitch bend control is one of the favorite routings of the aftertouch. I don't know exactly about the 9000, but there should be a menu where you can assign the aftertouch to different parameters (like the pitch bend), to mimick the sound of instruments like the guitar.
Best regards
Andrea
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.