Hi - I recently purached an Amplifi 75 and guitar and was really ppleased with them both. I was inpressed once paired the sound quality of the music player and being able to play my music through the amp. I then plugged my guitar in and found the four preset tones, whihc were good. I then went into the app, which I am using the android on a samsung S5 phone and started to play music and wthin seconds it had founf the releavant toones to match the song. I then tried to send these to the amp but this did not work and I have now given up after trying for several days. When the song from the library is playing and I select the relevant tone this opens up the amp and effects ont he iinterface but enne when I turn the effects on and off this makes no difference to the sound. I have watched several videos oon youtube and then seem to tap on the tione and this transfers through to the amp and then they open the effects and pay around with these but again this does not work on mine. Very frustrated now and really need help. I called GAK, where I purchased the amp who could not help and they put me through to Yamaha who said they would nto help as they do not have the contract to offer support. They then gave me a number to Line 6 iin Germany the closest support for this amp, which would cost a fortune to call. This is really disappointing after sales service. Thanks Kev