The S03 is the most portable member of Yamaha’s S series synthesizers. The Yamaha keyboard music synthesizer SO3 is the most inexpensive model from any manufacturer that can truly be called ‘professional’. It will gives you over 700 incredible voices, including many sounds from Yamaha’s top-of-the-line S80 synthesizer. It also features full XG/GM compatibility, 64 notes of polyphony, 16 multi parts, and complete synthesizer editing capability.
According to several user reviews, they have praised a Yamaha S03 for the decent Sounds; Slim Good Looking Design; Soundediting Capabilities. Also, some users have complained it for no Favoritesounds Buttons; Small LCD; Ugly Orange Lcd.
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To restoring a Yamaha S03 BL to it’s factory settings, first press the [UTILITY] key to enter Utility Mode. Then, press the [JOB] button in Utility Mode. When the “Factory Set” appears in the display, press the [ENTER] button. A message will appears, press the [INC/YES] button to execute the Factory Set job. When the factory reset has been completed, press the [EXIT] button.
Warning! When you execute “Factory Reset”, all the current settings for the all the Multis and User Voices will be overwritten with the factory defaults. So be sure to back up any information you wish to keep. Hopefully the article of “Reset a Yamaha S03 BL Synthesizers/ Workstations” can help you.
Reference: Yamaha S03 BL manual