The USB audio driver was added for the PW3 as it has no BT. Likely they never took it out. A €6 generic USB-A audio stick with a generic OTG micro-USB plug to USB-A socket (€4) works on PW3 if you download the speech pack softwares. I think two downloads. It doesn't have KK3 / DX(G) style TTS, but a kind of voice view where everything is synthesised voice, not just the book text. It's very awkward compared to simple TTS only as on the Kindles with a 3.5mm jack. Personal experience of all 3 and compared to Android apps.
Really and app and phone is far better for TTS or voice-view as the screen blanks and saves most of the power. Audio on any eink dramatically wastes charge run time as normally eink slightly sleeps till you turn a page.
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