AudioInsert

AudioInsert[audio, t -> new] inserts the audio signal new at time t.

AudioInsert[audio, {t1, t2, ...} -> new] inserts the same audio at multiple positions.

AudioInsert[audio, {t1 -> new1, ...}] inserts multiple audio signals at different positions.

Examples

Insert audio at a specific time:

audio = AudioGenerator["Sin", 2];
insert = AudioGenerator["WhiteNoise", 0.5];
AudioInsert[audio, 1 -> insert]

Please visit the official Wolfram Language Reference for more details.