OMG, just took out my newly finished Symphony Pro 2.5.4. I love it!! What a totally different experience to the regular 2 line kite. Taken my enjoyment of kiting to a new level.
Took a bit of trial and error to splice the bridals but got there after I realised that the string I was using wasn't good enough (initially tried using the line that came on the Symphony 2.5 Pro, but it didn't open up nicely and was nearly impossible to splice). I recently bought replacement quad lines for a Peter Lynn hornet so ended up using the old flying lines to make my bridals.
I managed to get my bother into it too after I bought my niece a Symphony Beach 1.3 for her birthday. He instantly bought a 2.2 pro and will no doubt be converting it after seeing my first flight video of the 2.5.4.
Strong work @riffclown thanks again. Can't believe HQ aren't selling the 4 line Symphony Pro kites out of the box but there is something satisfying about doing the conversion yourself (I even learnt how to use Mrs LeMac's sewing machine!)