The basic setting I use for the Berlin Grand is the Debussy scene with either the Dutch hall or the NY room. I have created some custom settings that use adjustments to many of the options that affect the overall sound. Things sound much better using headphones compared to the internal speaker system. Can using the internal speakers sound better? I listen to You Tube using a Bluetooth speaker system and a Sennheiser 599 open-back headphone, which I just got yesterday. There is a big difference in tone quality comparing the headphones vs. the internal speakers of the GP-500. The piano seems very quiet using the speakers. My room is pretty large being 50” x 20” and it can take a large volume of sound. Can adjustments be made to boost the volume?