The Yamaha S70XS is a weighted synthesizer that gives you a lot of features and an enormous Yamaha S70XS amount of diversity too. Originally launched a decade ago, Yamaha’s S line was designed to offer top-end sounds and features in a package specifically aimed at stage/solo performers rather than hardcore sound designers. All of the instrument sounds provided on the S70XS are incredibly accurate. The Yamaha S70XS provides enough quality and features for a professional musician to use.
According to several user reviews, they have praised a Yamaha S70XS for the great sounds including stellar new S6 piano; Super-easy to create splits and layers on the fly; Expanded control surface functionality for DAWs. Also, some user have complained it for the small display; Deep sound editing requires computer software; Nearly as wide as some 88-note keyboards.
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To restoring Yamaha S90 XS to it’s factory settings, first press the [UTILITY] button to enter “Utility Select” menu. Use the Cursor [∨]/[∧]/[>]/[<] buttons to select “Fctry Set” and then press the [ENTER] button. Finally press [ENTER] button again to start the Factory Reset operation.
Warning! This operation will cause all the data that you created in each mode or saved to internal flash memory will be erased. Before you perform this operation, check whether there is any data you want to keep. This procedure also applies to the S70 XS unit. Hopefully the article of “Reset Yamaha S90 XS 88-key Master Keyboard” can help you.
Reference: Yamaha S90 XS manual