I agree with Mr. Dragon, and offer this additional information:
If aftertouch is offered in a given keyboard, it usually takes the form of "channel aftertouch," meaning that the highest value of aftertouch (for a given chord or cluster of notes) will prevail for that entire channel at any given moment. Some keyboards offer "polyphonic aftertouch," meaning that individual notes are capable of responding to aftertouch. However, be forewarned this is a "touchy" issue, because in my own experience aftertouch is relatively hard to control with any degree of authority.
Here are two rather old URLs that mention polyphonic aftertouch:
https://groups.google.com/forum/#!msg/r … cWxydO3p8J
My ancient Roland A-80 (vintage 1990) has this feature. A quick google search should reveal other vendors and models with PA.
Last edited by jcfelice88keys (21-03-2017 18:22)