Have you set up the pcr in preferences/MIDI/ Devices and control surfaces ?? in devices check the boxes for your input/output pcr drivers. In control surfaces if it is not already set up click on the "add new controller/surface" tab (the little tab with the yellow star next to the red "X" for deleting control surface). From the dialog box that comes up, click n the drop down list, choose "edirol pcr 300" for the input port choose "pcr 2", and output port choose "pcr". By clicking the dynamic mapping button on the pcr will bring up the act properties page where knobs and slider on the pcr will automatically be assigned to faders and knobs in sonar. Or even by hitting the act learn tab in sonar, moving a parameter in sonar, then moving a fader, knob on the pcr, when you click off the act learn button, a dialog box will ask whether you want to keep the assignments, just hit yer and you can map what ever you want to control in sonar.