The first video I have posted is my project's proof of concept. I've a long way to go before I consider this project finished, but it feels like a good point to start logging my progress.

I got the volume control chip and the voltage inverter as samples so I didn't have much choice in package types. The CS3310 came in an SOIC-16 Wide so I ordered a breakout board from Adafruit ;) However, I got impatient and soldered magnet wire directly to the legs as a crude breakout. This is probably the limiting factor right now in terms of audio quality for the device. It can only be turned so loud before there's a lot of noise. 

In the end I had to wait for the real breakout boards anyway because the voltage inverter that I had (required for the -5 V DC input of the CS3310) came in a TSSOP 5-pin package. The footprint of the inverter didn't exactly match the breakout so I had to make a couple of small jumpers. Rough soldering job on this one too, but it works...

I'll get the schematic up soon and that should explain a lot. As soon as I clean up and properly comment my code I'll get that to github and link to it.