With less time between sounds, you will hear a mixture of both sounds instead of two distinct sounds.Ī popular reason to use a delay pedal is to achieve drifting and ethereal qualities during a guitar solo. The most significant condition is that there needs to be a difference of at least 30 milliseconds between sounds for our ears and our brain to distinguish those successive sounds. Just as specific conditions allow us to hear clear echoes in everyday life, there are specific conditions to produce that type of echo with a delay pedal.