What is C1 on a piano?
The lowest C on the keyboard (the third white note from the end) is called C1.
Is C1 a middle C?
English Pitch Notation
Similar to Helmholtz but differs in the lower octaves. Middle C is c1.
Where is C1 on a 61 key keyboard?
A keyboard with 61 keys has a total of six C's; middle C is the third C from the left. The first and last notes on a 61-key are both C's (C2 and C7).