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Yes, the “L”,  “R” and “-“, is the 3 SIP 0.1” connector mentioned.  Where the LR are obviously left and right. And “-” is GBUF, NOT GROUND.

Where the newer software supports the “M” (mono) and “D” (differential) speaker modes and commands. As to get loader. I suspect when you put the speaker inside the plush toy it will need the boost in volume.

Note the above mentioned link of the fork, no longer exists, it has been merged into my github master fork