Yamaha GC1 grand pianoIntroducing the Yamaha GC1M Grand Piano The GC1 grand piano is perhaps the most obvious 'upgrade' from the Yamaha GB1 grand piano. At 5'3'' the instrument is larger, and this alone is enough to give the instrument more depth, especially in the lower registers. Among other refinements, the GC1 also benefits from 'duplex scaling' which is a method of bringing out a fuller tone from a piano by tuning what are known as the 'non speaking' parts of the