The SoundDuino Arduino sound shield is capable of working with voltages from 3.3v to 5v and if you use the other Arduino boards, the only pins that you require are GND, VCC, RX, TX.

Posted in Arduino Hacks, digital audio hacks Tagged fft, Fourier, VU meter ← Coin-op Sega Rally Used To Race RC Cars Guitar Foot Controller Uses DSP For Audio Effects ...

This effort will provide developers with compatible libraries via the official Arduino Library Manager in Arduino Create as well as the Desktop IDE, and further comprehensive documentation, tutorials ...