I do agree that acoustic guitars are not that good, dont forget that the PX-5S is a stage piano with synth capability, there's not a lot of good guitar sound out there (synth) the only one I use are on my MOXF, there are some good electric sound on Korg and Roland, but acoustic, nope !, When I need a good nylon I use soft synth ( Omnisphere, Native instruments .....) metal I use my MOXF. It's mostly a sampling affair There's not enough memory space in the PX to have good acoustic sounds they did very well for the pianos sound with there new chip, but guitars, well I dont think it's a priority for Casio, and I can understand that. Padking