A method and system for improving performance in a disc drive using a genetic algorithm. The local wave form is generated substantially frequency and phase synchronized to the incoming voltage. Since moisture is removed from the process air by the moisture adsorbing device, it is possible to obtain air having a low dew point equal to or lower than an freezing point, i. The appropriate mode is selected automatically by detecting the frequency of the signal to be level shifted. The invention also provides edge-on imaging probe detectors for use in nuclear medicine, such as radiation therapy portal imaging, or for use in nuclear remediation, mine detection, container inspection, and high energy physics and astronomy.