There are few settings, the amp is easy to use. The sound is very correct, very low. One can nevertheless deplore the absence of a three-band equalizer that would refine the sound. Beware of the "boom" that is heard when starts.
I use it for twenty years. I am not a pianist, I use it as a versatile amp. It allows me to boost electric guitars (in the clear), or acoustic bass, sometimes a voice. For acoustic guitar, this kind of amp is a good compromise between the models specifically dedicated to audio, but sometimes expensive and electric amps that are not suitable at all. I will not comment on its qualities as a keyboard amp, but it is a good choice for a singer guitarist who wants to eventually connect a drum machine, or other instrument.