Thankyou alot for your input, instead of the wheel i plan to use a similar to this design (cheap and easy to replace) http://www.ebay.co.uk/itm/Pointer-Potentiometer-Knob-Black-Hard-Plastic-2-Pack-/300903165581?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item460f39ee8d . And the intergrated circuits do they come as standard or are the taloir made ? thanks again