Somebody did get a number of USB devices working on an older kindle using a USB hub, as posted in mobileread forums, as I recall. When the soundless K4 came out, I purchased a 10-pack of cheap (less than $1) USB sound dongles for that purpose (an unfinished project).
When I complete my project to add sound to my kindle video player, I plan to fiddle with USB OTG (and other hack methods such as modulating the frontlight for optical sound communications).
Any USB sound device ought to work PROVIDED you have a matching kernel module for it, and I plan to write kernel modules at some point (RSN).
A teardown of the official amazon sound device should show what chipset it is based on, and anything with that (or a similar) chipset ought to work with no custom kernel module (i.e. device driver).
Last edited by geekmaster; 05-18-2016 at 09:52 PM.
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