A stereo composite signal including a pilot signal is demodulated by processing input samples to obtain internal samples having variable sampling timings, synchronizing these sampling timings with the pilot signal, and digitally processing the internal samples to obtain stereo audio data. The number of locations assigned to each virtual channel may be dynamically allocated. The touch panel includes a first conductive layer. Display of the visualization can provide increased efficiency in processing time as compared to a fully computed projection. Also provided are writing and reading processes for such a memory circuit.