AudioDelete

AudioDelete[audio, t] deletes the first t seconds of audio.

AudioDelete[audio, -t] deletes the last t seconds of audio.

AudioDelete[audio, {t1, t2}] deletes from time t1 to time t2, returning the remaining audio as a single Audio object.

Examples

Delete the first 2 seconds:

audio = ExampleData[{"Audio", "Bird"}];
AudioDelete[audio, 2]

Please visit the official Wolfram Language Reference for more details.