I've used a TEA6300, no idea if it is still available.  I found a set
of them surplus from a MPEG card on an engineering project at Digital
about ten years ago.  We didn't need these little audio boards, so they
were chucked.

On 10th October 1993, says my Forth source, I got them working.  They
use I2C interfacing; SCL and SDA lines.  They had multiple input
channels, stereo, volume, tone, and a fader.  I was using them on an
80C85 platform, running FigForth.

Maybe there are later alternative chips.

--
James Cameron    mailto:quozl@us.netrek.org     http://quozl.netrek.org/

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