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Old 16th February 2014
Ok. You've inspired me to open mine up. It's just a standard gloss black soldermask, likely chosen because the case is transparent.

In case any of this helps:
- The ICs you pointed out as sound chips are standard TI LM324 Quad Op Amps

- The main processor is a Toshiba TMPM330 family ARM processor
TMPM330 Product Series - Toshiba Semiconductor & Storage Products Company