My plan is to take an Arduino r3, a bog standard Chinese 20K Galvo set(link), and create a 32 band Audio Spectrum Visualizer. I forgot to get the option that comes with the split power supply so I ordered a +-15V power supply off amazon. Following the instructables by delta flo (link) I ordered an MCP4822 DAC and TL082 op-amps in a pdip package.