Hi there,
I figured some nice solution if it comes to playing tracks/music from phone wirelesly by bluetooth. I bought a device from below link - it receives bluetooth audio and send it through 3,5 jack. On the other side is USB A which is used as a power source. In our case (Dwarf) I use an adapter from mini jack to 1/8 jack and connect it to the second Dwarf’s IN - the other In is used for guitar/instrument connection. USB is connected to Dwarf/s USB port and it works perfectly! Offcourse remember to make a connection in Dwarf editor from In 2 to both Outs to hear the music. I do not know why I did not make it earlier, now I can play any backingtrack/music through Dwarf wirelessly.