The Roland FR-18 diatonic V-Accordion is the world’s first diatonic digital accordion. The Roland FR-18 Diatonic V Accordion is a dream for accordionists seeking a world-class diatonic instrument that can do it all. Equipped with the same level of sound quality and natural, dynamic response that have made the rest of the Roland V-Accordion series win awards all around the world, the FR-18 diatonic takes the instrument to a whole new level of versatility. The FR-18 diatonic accordion features a sound set that lets you choose instantly from a lineup of 12 virtual diatonic accordions as well as a variety of orchestral instruments, Virtual Tone Wheel organs, percussion, and more!
What you get with the Roland FR-18 Diatonic are 12 onboard accordion models, including three user sets; Virtual Tone Wheel organs onboard with slow and fast rotary; Four user program registrations; Programmable keyboard and bass button layout; Drum function for manual percussion via bass and chord buttons; Headphone jack allows silent practice so you can play anytime, anywhere; Player is free to roam with battery (AA) power and wireless capability (optional).
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To restoring the factory settings your Roland FR-18 Diatonic, just simply power on while simultaneously holding the Treble Registers  and  until it flashing, and then release them. The Factory Reset procedure is complete. When the initialization process is complete, the four treble registers stop flashing.
Warning! When you execute “Factory Reset”, all stored settings will are replaced by the settings the FR-18 diatonic and returned to the factory settings. Do not use this function unless you are certain that you want to do this. Hopefully the article of “Reset a Roland FR-18 Diatonic V-Accordion” can help you.
Reference: Roland FR-18 Diatonic manual