I've been reading here for months waiting for my TS to arrive and today it has!
I quickly found that all sound and mic was not working and my heart sank. But reading this question and the poster's own reply, and a hint from elsewhere, I turned off "fast boot" in the accessibility menu, shut down and restarted, and hey presto, sound input and output works fine. The "fast boot off" setting seems to be required in order to make the device really reboot.
Many, many thanks to all here who have been contributing to the knowledge base on this device. Hopefully I can now contribute, if only from the point of view of a non-expert man-in-the-street end user, from time to time.