Striking a timpano then moving its pedal produces a glide effect

Evidence

The head tension varies as the lever is moved from note to note, and, if the kettledrum is struck immediately prior to the lever being moved, a rising (or falling) pitch is heard as a glide or glissando. This is sometimes used for musical effect. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1301

Categorization

Category: Causal Relationships

• QUESTION: This is a useful mechanical detail — does the glide only work because tension changes after the strike, i.e. while the membrane is still vibrating? Worth keeping as an example of intentional pitch-bend technique on an acoustic instrument.

Related

• Pedal-operated kettledrums produce glissandos when retuned mid-vibration. (similarity 0.89)
• Kettledrums retune by pedal over a five-semitone range (similarity 0.78)

Broader Connections

• Percussion excitation is a short impulse rather than a sustained tone #exemplifies (0.80) — David Howard, Jamie Angus, coustics and Psychoacoustics, 1288