AudioScope
Can you erase a sound but keep its echo?
Listen for the guitar hit, the silence and the echo that remains. Start at a comfortable volume.
Why does the echo stay?
Flip the polarity of an exact copy of the dry pluck. When the two dry signals line up sample for sample and match in level, their values add to zero.
The echo arrives later in the mix. Subtracting only the original dry pluck leaves that delayed sound audible.
Read the listening sequence
- 0:07.5 — A short guitar pluck.
- 0:08.3 — The pluck cancels. Silence.
- 0:09.4 — Two plucks with short echoes.
- 0:15.4 — Two isolated echoes.
Hear how timing changes the apparent distance of an echo