always draw a line; panning; updated analyzer to stereo

even when audio files have complete dead air, i've changed it to draw a tiny line; i think this looks better than blank spaces in the waveform
improved my analyzer to output a left and a right array of data on order to grab separate stereo data
have also wired up a panner, which shows up fine in the analyzer (unfortunately volume gain doesn't yet... probably just need to fix wiring)