Piano strings and soundboards can exchange energy producing audible loudness shimmer

Evidence

A variant of the energy sloshing scenario applies to a bowed violin, cello, and the like. The string mode may be driven by bowing and yet suffer similar sloshing back and forth of the vibrational energy, which continues as long as the bowing does. The result is the notorious wolf tone in many cellos and a few violins, as discussed later, in section 18.7. — Eric J. Heller, Why You Hear What You Hear- An…, 1022 (#expands, via linked claim)

Categorization

• XREF: connects to: A pianoforte with raised dampers can physically re-echo sung vowels via sympathetic resonance; Coupled-oscillator energy sloshing causes the cello’s notorious wolf tone — Eric J. Heller, Why You Hear What You Hear- An…, 1022; Slightly mistuned piano strings produce richer, longer-lasting sound (+3 more)

Broader Connections

• Coupled oscillators trade energy back and forth, creating audible beating #expands (0.85)
• Coupled-oscillator energy sloshing causes the cello’s notorious wolf tone #expands (0.82) — Eric J. Heller, Why You Hear What You Hear- An…, 1022
• A pianoforte with raised dampers can physically re-echo sung vowels via sympathetic resonance #expands (0.78)
• Slightly mistuned piano strings produce richer, longer-lasting sound #expands (0.76)
• Acoustic instrument sounds constantly change even during steady-state portions #expands (0.72)