Started prototyping for the visual aspect of the spektrum annalyser on my bose speajer adaption project, just got to code it now.  This setup has 2 8x8 bi colour led matrix and is driven by 3 74hc595 shift registers as well as 2 uln2803 transistor arrays and 8 MOSFETs which is a bit over the top but i dont have any standard transistors.