How do I remove the pitch control from the front of my tascam 38? I have removed everything else but this is giving me trouble. I can see there is place for a tiny screwdriver on the control but none of my tiny screwdrivers fit! The reason for taking the front off is to get to the audio cards and give the inside a nice clean. I thought I could just remove the bottom panel but found this to be impossible. Any pointers would be most appreciated.