All 3 Uses

acoustic
in
Ulysses, by James Joyce
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Acoustics that is.†
Chpt 11
Because the acoustics, the resonance changes according as the weight of the water is equal to the law of falling water.†
Chpt 11 *
The difficulties of interpretation since the significance of any event followed its occurrence as variably as the acoustic report followed the electrical discharge and of counterestimating against an actual loss by failure to interpret the total sum of possible losses proceeding originally from a successful interpretation.†
Chpt 17 *

Definitions:

(1) (acoustic as in: auditorium acoustics)
sound quality or its study, based on how sound bounces off surfaces

For example, acoustics affect whether a voice on stage can be heard clearly in the back of an auditorium, or how loud and echoey a busy restaurant feels.
(2) (acoustic as in: acoustic guitar)
of a guitar or other musical instrument: not using electricity to amplify sound
(3) (meaning too rare to warrant focus)