Changes
PSG
,/* Schematics */
The /A9 pin is non-existent on the AY-3-8912 model.
On the Amstrad CPC 6128 chassis diagram, we can see how the 3 channels of the PSG are mixed to the stereo jack (with channel B being shared split in half between the left and right output). And the 3 channels being mixed in equal parts to mono for the speaker and tape port. [https://www.cpcwiki.eu/imgs/4/4a/CPC6128_Schematic.png Source]
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