Assertion: accordion's sound | /r/HasProperty | different
Facets:
value: slightly
type: DEGREE
Source sentences:
text: Many accordions are diatonic, meaning that they produce different sounds depending on whether air is being pulled into the bellows or pushed out.
text: each sound two different notes depending on the direction of the bellows (for instance, producing major triad sequences while closing the bellows and dominant seventh or 7–9 while opening).
text: The increase in beat frequency as you advance pitch-wise up the keyboard is still very smooth and the beat frequency increase between any two adjacent notes is still barely perceptible, if at all, but the overall sound of the accordion will be slightly different because the beats will all be a bit slower near the middle of the keyboard than they would have been if you had used a linear beat progression.