spectrum-analyzer is used at run time in 3 crates. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps) spectrum-analyzer version
180 2 audio-visualizer dev ^1.1
110 2 lowpass-filter dev ^1.1
beat-detector ^1.1.0
integer_array ^1.1.2
onshape-level-gen ^1.2