3.Optical in-----Optical out & Bluetooth TX, please
If it is technically possible, we will make an option on the APP,All 3! ... But option 1 would be a start. Then I could have 2 BTA30s and daisy chain them to get around the problem with having 2 LDAC headphones connected at the same time.
i.e. In Bypass mode, with or without Bluetooth TX.