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The normal 88 keys were numbered 1–88, with the extra low keys numbered 89–97 and the extra high keys numbered 98–108. A 108-key piano that extends from C 0 to B 8 was first built in 2018 by Stuart & Sons. [4] (Note: these piano key numbers 1-108 are not the n keys in the equations or the table.)
A typical, full-size organ manual consists of five octaves, or 61 keys. Piano keyboards, by contrast, normally have 88 keys; some electric pianos and digital pianos have fewer keys, such as 61 or 73 keys. Some smaller electronic organs may have manuals of four octaves or less (25, 49, 44, or even 37 keys).
A keyboard matrix circuit is a design used in most electronic musical keyboards and computer keyboards in which the key switches are connected by a grid of wires, similar to a diode matrix. For example, 16 wires arranged in 8 rows and 8 columns can connect 64 keys—sufficient for a full five octaves of range (61 notes).
In a typical keyboard layout, black note keys have uniform width, and white note keys have uniform width and uniform spacing at the front of the keyboard. In the larger gaps between the black keys, the width of the natural notes C, D and E differ slightly from the width of keys F, G, A and B. This allows close to uniform spacing of 12 keys per ...
Keys Key size Preset Tones Polyphony (notes) Batteries MIDI Notes References ... (61 key), WK-7500 (76 keys) in 2010, 7.0w speakers ... 61 Piano-style 400 48
The E463 has 61 keys. PSR-E473 / PSR-EW425 (2021, 820 high-quality voices with Super Articulation Lite and 1 sample voice for sampling, 290 styles,30 built-in songs, 10 user songs, 8 banks with 4 registrations, and groove generator) The EW425 offers 76 keys and features phono jacks for connecting external powered speakers. The E473 has 61 keys.