Iver Jordal

Handle an edge case where AddShortNoises could raise ValueError("Cannot input empty array")

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This bug was introduced in 0.36.1 TODO: Write a test that reproduces the edge case

Remove pydub dependency

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Motivation: pydub appears to be unmaintained (last release in 2021, last commit to master in 2022)

Observed symptom: It sounds like it was pitch-shifted down by 12 octaves, and there is a distinct lack of coherence between the channels

When trying to pickle a RoomSimulator instance, an exception gets raised: `TypeError: cannot pickle 'pyroomacoustics.libroom.Wall' object` Context: Picklability is required for multiprocessing compatibility

Frequency shifting transform

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Frequency shifting could be useful for data augmentation applied to non-harmonic sounds, like drums/percussion and handling noises (e.g. rustling and tapping)