bad news: BT headphones do NOT work. At least the model I tried (
https://www.amazon.de/dp/B01ABVLE8Y/...075861_TE_item). It connects fine, but the two audio players I tried still just cycle through all songs in seconds. Have tried turning off the connection to the phone audio, leaving only the connection to media audio, but to no avail.
The headphones work fine with my mobile (android 4.2.2), so the issue must be the kepler
Next, I'll try a wired solution via usb sound card.
sharkcow