Assign an LFO either to pitch or Grain Pitch, then use Aftertouch as the “via” modulator in the middle row of the modulation matrix. So the LFO only modulates when Aftertouch is engaged.
Assign an LFO either to pitch or Grain Pitch, then use Aftertouch as the “via” modulator in the middle row of the modulation matrix. So the LFO only modulates when Aftertouch is engaged.