compliments > you have written some things better . . . . but still many gaps in many cases it is stated in brackets if receiver + sender etc. -> not here. what is it ? and ver.5.0 should also be in the title. backwards compatible is also difficult to understand > when receiving or transmitting ?????? my idea : I want a "transmitter" for the old record player and a "receiver" for the old amplifier - plus a dongle for the PC for keyboard or possibly also reception of the phono. ???does that make sense (question for music listeners with quality standards)??? thanks for your suggestions and answers