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Impulse responses am I correct
When we are talking about IR are we talking about using the different cabs that you swap out in a given app, that allow that in a a given app? So do I have a grasp on these impulse responses? Thank you in advance and thank you to all for all your help past and present, I tend to think some lack gratitude for all the help that you guys give out free of charge ~Jim
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From the Anderton's web site:
Cab sims achieve their sound via careful tweaking of EQ, distortion and artificial ambience. Some speakers offer a mid-rich tone, while others might provide a hefty low-end with an open sound – this can all be carefully dialled in and emulated.
An impulse response offers a similarly realistic sound, but rather than being artificially modelled, it’s been literally measured, recorded and recreated. Many argue that this provides an even more accurate tone, as it’s lifted directly from the original sound that you’re trying to emulate
There are some links in he AB wiki article to some threads of interest
https://wiki.audiob.us/doku.php?id=covolution_reverb_and_irs
Not necessarily. In a given app, cab simulation may take place by software algorithm or by convolution.
Algorithmic simulation is a combination of EQ and tiny delay or reverberation, etc, that the programmers have tuned to try to affect the sound in the same way a given cabinet would.
Convolution alters the sound based on an impulse response file that has been recorded by feeding a sound through an actual cab, room, whatever. The input sound and the IR are mathematically "convolved" together to simulate the effect of that actual recorded space. It's generally a more costly approach from a processing standpoint but is likely to be more accurate and satisfying than algorithmic simulation.
Presets in apps that use convolution are generally a selection of IR files the developer has included in the app. Some apps have an IR loader that allows you to load your own IR files. IR files vary in quality and character, so some people greatly prefer their own favorites. If an app doesn't allow loading one's own IR files, often people choose to bypass the cabinet simulation and use an external convolution app such as Thafknar or Impulsation to load their own.
Convolution can be used for more than just cabinet simulation. It's often used for reverbs and other purposes.
I’ve been trying out some IR recordings as experiments using the Impulsation app. I wanted to see if I could create different layers of space by hitting a block while walking around a large basement. Near and far to the mic.
Also I used recordings of thunder cracks with interesting results. That makes for a big reverb especially with the rolling echos.
One thing I’ve wondered but haven’t been able to try, is using binaural recordings of IRs . Might be fun to try but I don’t have a binaural mic.
In the simplest terms, traditionally what you have been used to when you play with an app like Bias… on the screen you have an amp head and a speaker cabinet. They are both algorithmic emulations of so and so… generally it has been the speaker cabinet sim that is a weak point of apps. Impulse Responses came along and greatly improved the sound of digital amp sims. They are short wav. files, usually 200 or 500 milliseconds, they are captures of actual guitar cabs in a room. So when we talk about using IRs, we mean you are supposed to replace the cab sim with an IR. Essentially you must think of an IR as your cabinet, that is all. It’s hard to grasp visually because it doesn’t look like a speaker cabinet, it’s simply a file you load into an IR loader or a convolution reverb loader. So they’re not “sexy” but they sound sexy as fuck. It is at least 80 percent of good digital guitar tone. Cabinet sims have improved but they’re not in the same league as using an IR instead.
Many apps have IR loaders now (like th-u). It wasn’t possible before to have IR loaders inside apps because iPads/iPhones couldn’t handle the cpu processing, now they can. When you load an IR, you must “bypass” the cabinet sim. Every guitar app has the Bypass button. That gives you just the amp portion, and it’s unplayable until you add the IR.
Nembrini amps and th-u rigs already come with a collection of pre loaded IRs. They already do no use cabinet simulation. This is partly why they sound so superior as it is. But you can still bypass those IRs and use your own even better IRs. When using a guitar app inside a DAW, you load the amp sim, bypass the cabinet portion, and load an IR into a separate app like Thafknar or IMPULSation. This is what you do when the guitar app doesn’t have its own IR loader, like Nembrini. You just add the IR app into the chain right after the amp sim, just like you would in real life…. Pedals > bypassed amp > IR loader (cabinet).
So to answer your question… you use an IR instead of the cabinet section of an amp sim, and make sure to “bypass” the cab section if you’re loading an IR.
Nembrini amps and th-u rigs don’t really have a visual representation of a cabinet. It’s just a module with a scrollable list of IRs. Same with 20th anniversary amp sim.
Hear the difference for yourself. Just replace the cabinet portion of any amp sim with an IR, and you will be amazed. Not to mention, IRs are cheap (or free) and are actually real life speakers and enclosures. So it’s cool to have an IR collection of favorites. As it is, the fact that you can separate the pre amp and power amp and cabinet section of a digital amp is awesome…
Thank you for this.