Double Duration

Tone groups in two note values having the ratio of 2:1 alternate (such as ) are not played according to their nominal durations. Instead, the short tone is lengthened at the expense of the long note.
Rule Double Duration induces this effect.

In this example two other rules are applied as well:

• Durational Contrast shortening short notes and lengthening long notes.
• Phrasing marking phrases and subphrases.

Example: W A Mozart, Theme from Sonata for piano in A major, K 331.

No-Double-Duration	k = 0	WAV file (1.8M, CD quality)	AU file (169k, good quality)
Medium	k = 1.0	WAV file (1.8M, CD quality)	AU file (169k, good quality)
Exaggerated	k = 2.0	WAV file (1.8M, CD quality)	AU file (169k, good quality)
Inverted	k = -1.0	WAV file (1.8M, CD quality)	AU file (169k, good quality)

The graphs show how much the durations of the tones are changed in % of their nominal duration.

No-Double-Duration, k = 0
WAV file (1.8M, CD quality)	AU file (169k, good quality)

Medium, k = 1.0
WAV file (1.8M, CD quality)	AU file (169k, good quality)

Exaggerated, k = 2.0
WAV file (1.8M, CD quality)	AU file (169k, good quality)

Inverted, k = -1.0
WAV file (1.8M, CD quality)	AU file (169k, good quality)