> transporting PCM samples between the USB host and the USB device. Seems like a great and simple idea but it might be not easy to negotiate between available

> transporting PCM samples between the USB host and the USB device. Seems like a great and simple idea but it might be not easy to negotiate between available PCM implementations on transmitting and receiving devices, I don't even know about what bus should be between two USBs and how to transmit silence to the receiving side if the transmitter device is unplugged, at least it requires to have a synchronized clock between two devices with fundamentally different ones. I expected this functional in Bluetooth, because Bluetooth has some established codec solution, but I have not seen a Bluetooth dongle which can transform a PC into Bluetooth-speaker.