I've looked for analogue output (DAC and amplifier) and input (mic amplifier) solutions for the Arduino platform for some time. There are some options, but they don't manage the full system of getting audio data rates into and out of the Arduino properly. So I decided to build my own.
After building 4 prototypes, I've finally put my project up on Kickstarter as a campaign. It is now 80% funded, with 10 days left to run.
If you've ever thought about making projects using voice, audio, or real 48k sample per second analogue output (not PWM), then this is great place to start.
Please, support this project if you can.