Add 7.5, 12.25 min of silence

[gabrivera]

This is amazing. Thanks for making this easy for me. Do you think it's possible to crate the two tracks above?

[vshmoylov]

I believe you can easily compose necessary length in any audio/video editor by stacking several tracks. For 7.5 minutes all you need is just to compose 5 and 2.5 minute files.

[rawr51919]

Audacity and others have features to let you create silence of an arbitrary length