I have been using my Privia PX-5S as a controller for my ipad 3rd generation. I use IK Multimedia apps. Among my favorites are SampleTank and Grand Piano. They havo a large variety of piano and other instrument sounds that are quite exquisite and very faithful to the real instrument. One of my favorite piano sounds is the 7" GRAND PIANO (natural, echo, flanger, phaser, etc). This sound is so rich and powerful that I would love to either adjust or add that piano type to the PX-5S. However, I could definitively use some help, because I am horrible when it comes to editing sounds. Is anyone well versed on this piano type? My deep gratitude in advance to whosoever will. --VictorMD victormd70@gmail.com