Systems for fitting an implantable cochlear stimulator to a patient include an interface unit configured to display a graphical representation of an implant fitting line as part of a graphical user interface. The color adjustment system includes a main mixing pipe connected to storage vessels to continuously receive flows of colorants from the storage vessels. The FEP pellet satisfies the following requirements and when used to form a insulating material coating a core wire by extrusion coating at a coating speed of 2,800 ftmin. The method includes computing an average power consumption by the motor over the ramping period. In one embodiment the waveguide medium is silicon oxynitride, although other depositable thick films may be utilized in place of the silicon oxynitride.