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Old 03-29-2010, 04:56 PM   #1
kristen
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Default can i "subtract" one waveform from another?

i was recording a conference call on track 1.
it was getting long so I stopped recording on track 1 and went to the next track to continue recording.
I forgot to mute the first track while the second track was recording so the second track is "mixed in" with the first track.
Is it possible to take a copy of the first track and "subtract" it from the second track ... leaving only the second track by itself?

thanks
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Old 03-29-2010, 04:57 PM   #2
Jae.Thomas
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what if you put the first track out of phase from the second? Or perhaps i am getting to complicated?
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Old 03-29-2010, 04:58 PM   #3
Dstruct
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yes. press the "phase" button on one track.
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Old 03-29-2010, 05:04 PM   #4
Blechi
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Assuming you didn't move the tracks forward or backward after recording you can try to invert the phase of track 1.
That should cancel out with the rerecorded signal on the other track.
To invert the phase of track 1 activate the button that's left of track 1's mute button.
With the fader of track 1 you can adjust the amount of cancellation.

hth
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Edit: I'm too slow for this forum ...
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Old 03-29-2010, 08:23 PM   #5
kristen
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it didn't work.

track 1 contains track 1
track 2 contains track 1 and track 2.

the first track is embedded into the secongd track.

if i press the invert phase button and play both tracks, i still hear both tracks. is there a way to change the phase or is it just "in phase" and "out of phase"

Does it matter if it stereo or not?
I noticed that it recorded both tracks in stereo. i should have mentioned that but didn't really notice as i was concerned with the sound.

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Old 03-29-2010, 08:24 PM   #6
Jae.Thomas
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look for JS: phase adjust in the JS plugins section, maybe that would work.

i would be more than happy to take a stab at it, if you wish.
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Old 03-29-2010, 09:09 PM   #7
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Quote:
Originally Posted by Jason Brian Merrill View Post
...i would be more than happy to take a stab at it, if you wish.
Yes, me too.
Can you upload a short snippet of the same part of both tracks?
(without any FX and best lossless, not .mp3)
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Old 03-30-2010, 06:42 AM   #8
karl
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Default Do you mean you have 2 takes?

I'm wondering if people are misunderstanding the situation you are in. If you've recorded over audio into a track that already has audio on it, have you now got two *takes*? Does it look like you've got two tracks of audio (one above the other) together on one track? (If you've got your track panel heights small, enlarge them to be sure).

If so, right click on the track item - there should be a menu item called 'takes' (or something like that - not at a PC with Reaper at the moment). In there there shuold be something like "explode takes to separate tracks".

You should then be able to treat both tracks independently.

(Edit: Just re-read your posts - and I don't think you are in this situation afterall. Sounds like the audio from track one was routed to track 2 while you were recording. But inverting the phase of one of the tracks should help...)
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Old 03-30-2010, 10:07 AM   #9
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Quote:
Originally Posted by Blechi View Post
Yes, me too.
Can you upload a short snippet of the same part of both tracks?
(without any FX and best lossless, not .mp3)
Its pretty long. about 25 minutes on each track.

Do you think if I took about 10 seconds of each track ... and send as a wave file ... would that be enough for you to experiment? how much do you need?

Would i send two separate wave files?

where do i upload the files?

thanks
kristen
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Old 03-30-2010, 08:06 AM   #10
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Quote:
Originally Posted by kristen View Post
it didn't work.

if i press the invert phase button and play both tracks, i still hear both tracks. is there a way to change the phase or is it just "in phase" and "out of phase"
The phase button takes it 180 degrees out of phase. If the first track had no FX when you recorded the 2nd track then it should cancel itself out.

However, the 1st track has to be in total alignment with the way the 1st track was dubbed to the 2nd track so you might have to shift the 2nd track back ever so slightly (it wouldn't take much). You can experiment by zooming in real close (probably into the sample level) and adjusting the 2nd track slightly back and forth to try find the position where the 1st track disappears the most.

Also the volume relationship between the two tracks may need to be adjusted.

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Old 03-30-2010, 09:00 AM   #11
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What Tod said...

>
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Old 03-30-2010, 12:25 PM   #12
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Quote:
Originally Posted by planetnine View Post
What Tod said...

>
+2

When the 2nd track recorded the output from the first, it's probably a few samples later than the original.


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