Pause / Continue playback or practice (not while typing)
Enter
Hear the focused piano key · play the song from the focused notation chip
← →
Step the piano chromatically · walk the notation chips · cycle grid/scroll/single in the mode segment
↑ ↓
Move the piano an octave
Home / End
First / last token (piano + chips)
Right-click key
Add that note to the melody
Quick tap chip
Play the song from there (touch and mouse)
Hold chip / key
Hear just that one note (about ¼ s)
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Show / hide this list
Notation chips (button-shaped): activating one plays the song from
that note; on touch a quick tap plays from here, a held press auditions
the note once. Piano keys: activate or click to hear the note;
right-click (or two-finger context) adds it to the melody. Tan pills
mark text outside the melody notation — fix or remove them.