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PStamler PStamler is offline
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Default Why don't these signals null?

On Sunday, October 20, 2019 at 5:13:37 PM UTC-5, James Price wrote:
On Sunday, October 20, 2019 at 12:31:59 PM UTC-5, Scott Dorsey wrote:
James Price wrote:
Let's say I record a DI guitar part into a looper, then re-amp that looped part and record the output twice to separate tracks in a DAW, time-align them and invert the phase on one. I know the tracks won't null, but I don't fully understand the why.


They don't sound the same, so why would you expect them to null?

The whole reason you run the signal through a cabinet is to change the
waveform. So don't be surprised when it does just that.


I'm curious why the signals don't null when changes imparted by the cabinet
are controlled for, though? For example, sending a looped guitar DI to
an amp and then running that through an impulse response of a guitar cabinet.
Again, the caveat is that clean tones *will* null, thus I'm referring to
distorted and overdriven tones.


If I understand what you're describing, you're trying to null a signal that's been run through a guitar cabinet with one that's been run through a *simulation* of a guitar cabinet. Two possible explanations occur to me right off; the first is that simulations aren't perfect. The second is that though the impulse response you're trying to null the cab against may have been made using the same make and model of guitar cabinet, it wasn't made with the *same* guitar cabinet you're trying to null it with. Nor in the same room, nor with the same microphone.