Here's a trick to get full aftertouch on any PSR9000 voice:
1) Save your setup in a registration memory
2) load synth voice Impact(has heavy aftertouch) into R1/R2/R3 (all that
you want aftertouch on
3) load your registration memory with the Freeze botton lit
and Voila! You have heavy aftertouch on all voices that previously was
loaded with the Impact voice.
It seems to work no matter what freeze settings you set. Try it out!

Per Ostrup

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PO