Is this setup possible - so that the LG tv sound uses Wisa to my speakers without reduction of sound quality and the possibility to use the LG remote control to control sound level from TV - and my Beosound Core and Transmitter 1 still continues to use the speakers when playing music from my phone - with the possibility to use the phone to control sound level when playing from this?
I believe the speakers can only be connected to one Wisa-product. So either you connect the products to the Wisa dongle in the TV or you connect them to the Transmitter 1.
I think the best solution to your problem is to connect the TV not to the Core but to the Toslink-input on the Transmitter 1 and add the IR-receiver to the Transmitter 1. That way you keep the functionality of the Core and have the sound of the LG tv controlled by the LG remote.
Use your TV remote control to adjust speaker volume If you want to be able to control the volume of your Bang & Olufsen speaker set-up using the remote for your non-B&O television, this is also possible. All you need is the Bang & Olufsen RCV3000 IR receiver, available in your local Bang & Olufsen store. The receiver connects to BeoLab Transmitter 1 using a simple USB plug and doesn’t require any external power source. RCV3000 works with the latest generations of Samsung, LG and Sony remote controls.