Guitar Pedal Simulator with LtSpice
Wave files can be imported directly.

Copy the .wav file to the directory of the project
For the voltage source that you want to output the wav file, ctrl+click and edit the value field
The value should say wavefile=file.wav (where file is the file name)

Source:
https://www.analog.com/en/education/education-library/videos/5579265677001.html