This is an SG2 type Silent piano featuring a CFIIIS sound source. Yamaha Silent Pianos are acoustic pianos featuring sound-damping capabilities that allow players to plug in headphones and jam away without disturbing others. Silent Pianos combine the best of Acoustic and Digital Pianos. Yamaha’s prime goal is to ensure that they provide a beautiful acoustic piano, built with the knowledge and skills of over 100 years Yamaha pianohistory.
They can also be played like any regular piano, combining the authentic sound and touch of acoustic pianos with the convenience of digital models. The Silent Piano’s incredible sounds are sampled from the top-of-the-line Yamaha CFX and CFIIIS Concert Grand Pianos. Even in silent mode, the piano faithfully reproduces an acoustic sound through headphones. Yamaha’s Silent Grand Pianos are equipped with Yamaha’s QuickEscape mechanism, which optimises the movement of the action, both in silent and acoustic modes.
Image source: pianova.com
To restoring your Yamaha B1 SG2 to it’s factory settings, just simply hold down the A-1, A#-1, and B-1 keys and press C7, the highest key on the keyboard for a few second, and then release all the keys.
Warning! This procedure will returns reverb, pitch, and DDE to their default settings. Do not use this function unless you are certain that you want to do this. This procedure also applies to the B1-Silent, B2-Silent, B2 SG2, B3-Silent, B1 SG2 units. Hopefuly the article of “Reset a Yamaha B1 SG2 Silent Piano” can help you.
Reference: Yamaha B1 SG2 manual