Creating IRs from digital sources...READ THIS ;-)

THE BEST WAY TO CREATE AN IMPULSE RESPONSE:
This technique ONLY works if your staying in the digital domain......
eg: IRing a Lexi 960 or similar that is hooked up over spdif / etc... or (WAVES, Altiverb libraries This Technique WILL NOT yield results in the analog domain....for that you will have to deconvolve and sweep.
1) Record some silent audio.......(in other words nothing)
2) Open "nothing recording" in sample editor.....silence the whole thing.
3) With the pencil-tool draw 1 spike (it has to be just one)
4) Now set-up a digital-reverb on a buss in Logic (set to 100% wet)
5) Place "spike" audio on an audio track
6) Route that tracks output to the Reverb buss.
7) Bounce in real-time the reverberated spike
8) Open the reverberated spike in the sample-editor and chop the the front and rear
YOU ARE DONE
You now created a perfect 100% impulse-response....completed perfectly cloned....no deconvolution needed...it's done!
I work for a major video-game company.........and our Audio-Programmer (a genius) taught me this......(He has a doctorate in synhesis)
You see the sine sweeping is neccessary only when IRing in the analog world .....The result of deconvolution is actually a spike..
So the other week I was at a friends place....He has altiverb and IR1 from waves....Their libraries have fantastic famous drum rooms / concert-halls etc......
I spiked it all
I'm not kidding...If you don't believe me ( I was-a non-believer myself....) Just research it ...........It's the best kept secret For years I was friggin sine-sweepimg digitally hooked-up reverbs....takes forever and the result is not as good as the spike technique....
The Spike technique is 100% acurate..
Go have fun
Cheers.
SvK

You can draw by hand whatever impulses responses you want in the digital domain. As to whether they will faithfully replicate any of the "famous" reverb trails that some libraries go to great lengths to capture is doubtful I think, though it would be interesting to do listening tests to compare them. But given the sensitivity of the ear in the analog domain, the complex nature of impulse responses that are well cpatured from complex acoustic environments, and what you can draw with your hand - I would bet that no IR vendor is losing any money to someone trying to replicate the impulse response of the Vienna Philharmonic's hall with the pencil tool in Logic.

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