help please!

Hello gurus,

please help me.  I want to make it so if I press my key with a certain velocity then it will trigger karma, otherwise it play normal.
and also i don't think the aftertouch of my keyboard is working.  it doesn't do anything if i press the note harder after I played it unlike my roland xp30.

what i'm trying to do is mimic the acoustic guitar sound of the yamaha.  if you press the key hard enough, it bends to that note from a half step below. I would send this on karma forum but I think they are more supportive now on the M3 and the Oasys.
Please help.  many thanks in advance. here is the sound i want to reproduce if possible:  02:20 
http://youtube.com/watch?v=F=ivpz7cjo8&feature=related
Thang



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