Firmware version 1.10 Required In this tone, the main Concert Grand tone on the PX-5S has been modified to provide a narrower dynamic range. For some players, the dynamic response may seem too wide or difficult to control. This narrowed response may be just what you're looking for. It is recommended that you use the "Piano<Dynamc" Stage Setting with this tone as this change in response alters the depth of the Damper Resonance Effects.