file1.wav 02:40+54392s 03:03+26995s fade 0 5
file1.wav 03:31+26995s 04:35+08823s fade 0 20 pad 1.5 2.5
file2.wav 14:12+26995s 15:02+08823s fade 15 5
file3.wav 0 5
output_file.wav
