what can ir's be used for besides reverb?

[Music Engineer]

Code: Select all

systemOut(weight1*signal1) + systemOut(weight2*signal2) = systemOut(weight1*signal1 + weight2*signal2)

a little self-correction: while the statement above is true, linearity also implies that we can take the weights out of the parentheses on the left hand side:

Code: Select all

weight1*systemOut(signal1) + weight2*systemOut(signal2) = systemOut(weight1*signal1 + weight2*signal2)

o.k. enuff math for now.

[shamann]

What effects work well on an IR, for example, would a non-linear effect really have any worthwhile effect?

Non-linear effects won't be captured effectively in IRs, so they don't tend to make a big difference. They do alter the harmonic content and the volume of the IR, though, so they can be useful. Just don't expect to capture fuzz in an IR and have it distort the audio.

Time-domain stuff like modulated filters (wah/phasers), delay effects, amp modulators, timestretch/compression, FFT filtering, etc, all make great IRs.

[Music Engineer]

What effects work well on an IR, for example, would a non-linear effect really have any worthwhile effect?

Non-linear effects won't be captured effectively in IRs, so they don't tend to make a big difference. They do alter the harmonic content and the volume of the IR, though, so they can be useful. Just don't expect to capture fuzz in an IR and have it distort the audio.

Time-doamin stuff like modulated filters (wah/phasers), delay effects, amp modulators, timestretch/compression, FFT filtering, etc, all make great IRs.

...just don't expect to capture the time-varying aspects of those effects

[shamann]

...just don't expect to capture the time-varying aspects of those effects

Not sure I follow. The time varying stuff is exactly what transfers. Make a simple IR of white noise with a fast decay. Copy it, paste after the first instance, reduce the volume by 50% on the second iteration, use it to convolve a sound. You'll get an echo on the final result.

Here's an example of that process.

Or are you meaning something different by time-varying?

[Barbed Wire Kiss]

What effects work well on an IR, for example, would a non-linear effect really have any worthwhile effect?

Non-linear effects won't be captured effectively in IRs, so they don't tend to make a big difference. They do alter the harmonic content and the volume of the IR, though, so they can be useful. Just don't expect to capture fuzz in an IR and have it distort the audio.

Time-doamin stuff like modulated filters (wah/phasers), delay effects, amp modulators, timestretch/compression, FFT filtering, etc, all make great IRs.

...just don't expect to capture the time-varying aspects of those effects

That's good to know. I'm after strange effects so it would be boring if a phaser on the IR would result in the same phaser effect on the final affected sound. In a similar way, while I wouldn't expect a non-linear effect, distortion for example, to come through I'm think perhaps the change in frequency content and volume might have a limited effect.

[shamann]

I'm after strange effects so it would be boring if a phaser on the IR would result in the same phaser effect on the final affected sound.

Oh, I see what braindoc meant now. I sort of took that as a given. Oddly enough, with things like phasers, the convolved result can sometimes sound stranger since the same sweep gets repeated, which doesn't sound like you'd expect a phaser to sound.

[shamann]

Here's an example of an IR with a phaser. The phaser doesn't sound quite like it should, which is an effect that could be put to good use.

[electro]

EQs.

[sinkmusic]

filterbanks ?

[Barbed Wire Kiss]

I had a little play last night with various effects, and the non-linear effects came up with the most unexpected results. The non-linear effect do come through the convolution process, they are just not the same effect as was heard on the IR.

I was using a audio editor, and I also found that if the IR is longer than the sample I get very different results than if I pad the end of the sample with silence.

[sinkmusic]

filterbanks ?

autoreply : Yes... ! !

http://www.sknote.it/

[smp]

Spirit Canyon Audio!

+1 on this one

Go to Spirit Canyon and listen to the demos for Spectral Relativity, Kaleidoscopy and Sanitarium to hear what can be done with "non traditional" IRs.

Caveat: I did some of the Sanitarium demos so I may be biased on this one They really are a whole stack of fun to play with.

-s

[Barbed Wire Kiss]

Are there any IRs for emulating the body of a guitar?