Play chords and notes on a virtual piano keyboard with sustain and octave selection.
Click a key and it sounds; click several and they ring together. The chord control stacks a chord's notes at once, and the octave selector moves the playable range up or down so the same note names are reachable in different registers. Sustain lets notes keep ringing after their keys are released. The surprise for most users is register: the same chord name sounds entirely different an octave lower or higher, so when something sounds wrong, the octave selector - not the chord - is usually what to check first.
A concrete input and expected output from the current implementation.
Input
Select C major, octave 4
Expected output
The tool sounds C4, E4, and G4 together - 261.63 Hz, 329.63 Hz, and 392.00 Hz.
A major chord is the root plus a major third and a perfect fifth above it: for C that is C, E, G. In octave 4 those are C4, E4, and G4 at their equal-tempered frequencies.
Each key on the keyboard is one note; clicking it sounds that pitch, and pressing several keys at once sounds them together, so any chord you can find on the keys is playable even if it is not in the preset list. The chord control plays a named chord's notes simultaneously instead of requiring you to place each note yourself.
Sustain holds a note after its key is released, so the sound fades on its own rather than stopping with your hand. The octave selector shifts the playable range in whole-octave steps, moving every note up or down together. Both controls change what you hear more than the individual keys do.
Sustain is on. With sustain engaged, notes keep sounding after their keys are released and fade on their own instead of stopping with your hand. Turn sustain off and notes stop the moment you release the key. If a short ring remains after that, it is the natural decay tail of the tone, not sustain.
Both. Pressing several keys at once sounds them together, so any chord you can find on the keys plays, preset or not. Use the chord control when you want a named chord stacked for you - a C major built from C, E, and G, for example - without hunting for each key.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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