january-2009

Using impulse response/convolution reverbs to help smooth out your sound.

Most of us would probably agree that the sound of a tasty reverb on a great guitar part is a thing of beauty. And you’d think that with all the latest generation of guitar plug-ins, this wouldn’t be that hard to achieve. Unfortunately, most of them are sorely lacking in this one all-important area. One way to get around this problem—aside from owning classic amps—is to use any of the widely available impulse response/convolution reverbs to help smooth out your sound.

As a quick reference, a convolution reverb is a process where a pulse or sine wave sweep is played back into a space or actual piece of gear such as an amp or reverb unit. Using a process called deconvolution, the sine sweep is then removed leaving a clean sample called an impulse response.

When needed, I tend to rely on a number of different plug-ins to get these great reverb sounds for guitar. Audio Ease Altiverb, Digidesign TL Space, Waves IR-1 and McDSP’s Revolver are used daily in my Pro Tools system, although there are several other excellent brands available as well. Specifics vary, but most will work across the popular platforms such as RTAS, TDM, VST and AU.

So, what is it about these IRs that make them better (typically) than a traditional reverb? While the quality of the actual sample is, of course, important, it’s the fact that you’re actually hearing the real thing. When you put your instrument “into” the reverb from an old Fender amp, the sound just comes alive. The depth and character of real reverb is an almost tactile issue, and each person will have their own opinions on their favorites.

One of my first go-to settings is Altiverb’s Fender Super Reverb. The samples done for Audio Ease by Joe Gore are simply selectable as Bright or Normal. The Reverb Time (RT) is fixed at 6.70 seconds, but you can shorten it if needed using the RT dial. Gore also has samples of a Magnatone 480, a Baldwin Amp and a Real Tube Reverb, all of which are also quite nice. Altiverb also lets you sample your own amps, which I and Vincent Miraglia of Analog Design group recently did when we recorded the tasty reverb of my 1964 Gibson Falcon amp; an amp I also turn to quite a bit when needed.

And don’t think about just using the sound of actual guitar amp reverbs. You can call up such goodies as EMT 140 and 250 plates, Echoplates, spring reverbs and echo chambers. By using a buss to send just a little bit to one of these IRs you can get dull-sounding electric guitar parts to stand out. For a really “wet” signal, enable the “Pre” button on your reverb send/fader. This will send the audio directly into the reverb, bypassing the fader level. You may have to pull your fader down to compensate for the dry/wet balance, but you’ll get a full wash of ’verb that way. Experiment with that setting for a lush sound.

Impulse response settings are not just for electric guitars or amp simulators. Amazing sounds can be had for acoustic guitars as well. Think about recording that beautiful acoustic you have in your bedroom, or in a small, tight space. Yes, it probably sounds good up close, but what if you wanted something more? This is the perfect situation to use an impulse response.

One of my favorites for acoustic instruments is The Stone Room at Masterfonics Studio in Nashville, Tenn. Available in the Waves IR-1, it adds an incredible sense of depth and brightness. Also, there are many other great sampled recording studios, scoring stages, churches, opera halls, arenas and even stairwells available. Not every studio/room works for the sounds you’re seeking, so its best to get a setting, and then on the plug-in itself run through different IRs. Sometimes the room is too big, too dark or too bright. That’s when it’s time to break out some more plug-ins.

The essence of dialing in one of these sounds is to get that perfect fit in a mix situation. To lift a track up or even set it back behind the rhythm section, you may want to try EQ-ing the reverb. Instead of just settling for the sound of that plate/amp/room, try placing an EQ after the reverb. While yes, some IRs have settings allowing you to EQ the actual output, they are usually limited in scope. I tend to use a good, flexible high-quality EQ such as the Sonnox Oxford EQ, Universal Audio Cambridge, URS A10 or the EMI TG1214. These allow me to really dig into which frequencies need to be boosted or cut. Of course, you can patch in a hardware reverb as well—whatever works best for you.

Placed directly after the reverb plug-in, you can then roll off the unwanted/unneeded low frequencies (usually below 120–150Hz) in the ‘verb itself to clean up the bottom of your mix. Then, by sweeping the EQ you can also boost and/or cut any frequencies to accentuate, like string noise on an acoustic or scratches on your electric part. Impulse response reverbs are simply great for adding character to a mix. For guitarists, it’s a surefire way to get that flat-sounding DI track or amp simulator to really shine. Poke around the Internet for yourself and see which version might work best for your studio setup. Your guitar will certainly thank you for it.

Read MoreShow less

The man behind the tones of Jimi, Beck, Page and countless other Octavia users talks about the past and future of effects.

Although it’s a well-worn cliché, it’s only appropriate to say that Roger Mayer has seen it all. Yes, he’s been there—hanging out with Jeff Beck, Jimmy Page and Big Jim Sullivan in the studio, soldering together brand new circuits, innovating and designing solutions for the earliest of tone chasers. He’s done that—watching Jimi Hendrix plug in his new prototype during a late night Olympic Studio session and laying down solos that would launch the dreams and careers of thousands of guitarists to come. Mayer has seen it all, because odds are he created it. His drive to innovate has made him a larger-than-life personality among guitarists, popping up at numerous junctions of music and gear history. He has made a life practice of always pushing forward, and rarely looking back.

Which, of course, makes an interview with Mayer a bit of a challenge. While he acknowledges that everyone wants to talk about Page and Beck and Hendrix—and is perfectly happy to revisit those stories—there’s a part of Mayer that seems indifferent to the nostalgia. He was there; he’s told that story before. And even though his company, Roger Mayer Guitar Effects, largely exists to dole out the effects that Hendrix made famous, they have not remained static. The company’s Vision Wah features a uniquely ergonomic profile and a treadle made of carbon fiber; he estimates that R&D costs for the project came in at over $150,000. Bread and butter effects like the Octavia and the Axis Fuzz are continually refined and re-engineered, because to Mayer it’s a simple equation: evolve or fade away.

We were able to spend some time with Roger Mayer, to talk about both the past and the present, about his days tinkering in Olympic Studios, and the future of guitar effects.

You started experimenting with pedal designs while you were hanging out with guys like Jimmy Page and Jeff Beck, right?

Yeah, basically. Going way back when I first started, when I was hanging out with them, we were obviously interested in the sound of the guitars on the American records, which were quite hard to come by. We had a really big interest in the different guitar tones that they were producing in America.

What guitar tones were you trying to replicate?

Well, you know, like some of the Elvis records, the Ricky Nelson records back in the sixties, and so forth. We were kind of interested in that, and the first pedal that I built was a treble booster, actually. And looking at the circuit of the Rangemaster, it looks virtually identical to the ones I built back then, you know? [laughs]

Did you have any examples, like the Rangemaster, to look at while you were designing these circuits?

Well, the Rangemaster actually came out after I built mine—they were after the fact. I don’t know anyone that was building them back then.

Did you have a name for your invention at the time?

We didn’t call them anything, they were all prototypes! They weren’t in production, you know. I really didn’t start producing commercial units until about the eighties. So you just called it a treble booster? We just called it what it did—it’s a treble booster, you know?

Were you hearing other fuzz tones around then?

No, no. The first fuzz boxes that Page and I really became aware of, I think, were on the record by the Ventures called “The 2,000 Pound Bee”. That was the first time we thought, “Oh, wow! What is that?” Obviously we had a few contacts in the States, and they said that was a fuzz box. And I asked, “What’s that?” And they said it was basically an overdriven transistor.

Did you like that sound? Or did you like your treble boosters more?

The early ones—especially like the early Gibson Maestros that were featured on “Satisfaction,” which was after Page started using them—didn’t have an awful lot of sustain. They were quite percussive in nature. So I never actually… I don’t think I’ve ever actually played through a Gibson Maestro; I’ve never even bothered with one. I kind of heard what they sounded like on the record, and thought, maybe we could do something a little similar, but with a little more sustain and make it smoother.

You were tweaking on all of these early prototypes in the studio. Do you still enjoy being in that environment?

Oh, definitely. I’m much happier in the studio.

Why’s that?

I like the studio because it’s probably the ultimate creative environment. You have control over so many more things than you would in, say, a live performance. You’ve got control of echo; you’ve got control of pan. You’ve got multiple tracking, you’ve got all kinds of things you can do in the studio that can paint a very interesting sonic picture that you can’t do live. Listen to Hendrix on Axis: Bold as Love. Of course Jimi’s good live, but at the same time we obviously knew playing live you’re probably only going to use three or four sounds. And you’re obviously going to get completely saddled with the acoustics of the room, aren’t you? If the room’s got a nomic types huge amount of reverb, then you’ve got it—you’ve got it on the soft part of the song, you’ve got it on the loud part of the song. You’ve got it all night long, haven’t you? That isn’t going to change, whereas if you’re making a record you can move from echo to drive; you can do all sorts of things. So the amount of control on a record—it’s a far more satisfying experience to actually make a record that can be heard thirty years later and still be appreciated. You can’t say that with a live performance. Only the people that were there heard it live, and I’m not talking about some sort of quasi-live recording that might have been overdubbed four weeks later, you know? [laughs]

I hate to focus on the past, but how did you meet up with Jimi?

I met him in a nightclub a few days after my 21st birthday. I just went up to him and I talked to him—everybody was there, you know, the Stones, the Who, McCartney. I just said, “Listen man, I’m really into guitar sounds and I’ve done a few for Page and Beck and these people.”

And he was excited, I’m sure.

Oh, yeah, obviously. We were obviously on the same page from day one.

So did you just go into the studio with him after that?

Well, I went to one gig at Chislehurst Caves about two weeks after I met him and showed him one of the first Octavias backstage. He played through it and said, “Can you do that to it?” and I said, “Yeah, Jimi, you know these things are improving week by week as we get more feedback on it.” And he said, “Right; I’m playing at a club called the Ricky-Tick at Hounslow in about another week. Why don’t you bring it along to the gig and after the gig we can go back to Olympic Studios. I gotta record a couple of solos for a couple of tunes I’ve got.”

So after the gig—it was a very low ceiling at the gig, and he put the neck of his guitar through the ceiling; it basically fucked the machine heads on the top of his guitar, right? And we didn’t have a spare guitar then, so we went back to Olympic afterwards, and we had to send Noel around to the flat. He picked up his Telecaster, and that’s when we did the overdub for “Purple Haze” and “Fire,” using the Octavia.

What was the idea behind the original Octavia?

Well, I was thinking as you go up the fretboard, wouldn’t it be nice to double the frequency, so you could play notes that weren’t even on the fretboard, you know? That was the idea really. And then we looked at it, electronically and figured out what to do. We came up with the mirror imaging technique. Most people think it’s full-wave rectification, but that’s not an accurate description of it.

What would be an accurate description?

It’s a mirror imaging technique in electronics. The way it’s actually implemented virtually makes it like a mirror image, you know? It’s a phase-inverted mirror image of the signal, which makes it double.

The Octavia has evolved since those early days. Are you finally happy with the design, or are you still tweaking on it?

Yeah, because there are always things you can do, you know?

Will it ever be finished?

No, I don’t think so. I’ve got a Formula One attitude; there’s always development to be done. There’s always something you can do to make it better, to make it slightly different, to make it use a little bit more input from the player. The current range of, say, the Vision Octavias are much more expressive than the old ones. That’s one of the main reasons I never reissued the transformer version, because it’s like taking a step backwards—there’s no point whatsoever.

And that’s kind of your general philosophy?

It’s forward, never backward, you know? You wouldn’t want Volkswagen to go back to making the same cars they made back in the day. You’d say, “What the fuck is this? This is ridiculous!” Those who can invent, do, you know? Those who can’t, copy.

Digital modeling looks to be that next frontier, and Jimi’s rig has even been the focus of a few software packages. What are your thoughts on that?

[laughs]. Well, let’s put it this way: if you know anything about digital modeling, it’s basically painting by numbers. I mean, the whole thing about any modeling process is that you are making an approximation before you’ve done anything. So it has nothing to do at all about the live performance. It would be like the difference between adding echo to something and playing a guitar where the echo was part of the song.

Do you feel like the guitar industry is caught looking backwards more often than not?

All I can say is, don’t you think it’s like that? Of course it is. I mean, you’ve got so much supposedly retro stuff—retro effects, retro guitars, retro bands—it’s sad. It really is sad, because it’s not giving younger people something of their own, is it? And it’s crazy. Take the stupid concept of buying a guitar that has been aged. That would be like a girl hanging out a pair of ballet shoes in her bedroom that have been aged to look like they’ve been worn by a famous dancer. What’s the fucking point? You’re trying to buy into looking cool; it’s fashion, it’s like buying beaten up jeans.

But isn’t digital where we’re headed?

No, not at all. The fact of the matter is, and the thing that never changes, is that the ears are analog. And analog information is continuous; digital isn’t. Digital, if you equate it to a movie, would be like looking at a close-up where the face is in perfect focus and the background is fuzzy and out of focus, as opposed to a wide shot or another shot where the face and all of the background were in perfect focus. There’s obviously more information in the shot where the background is in perfect focus, right? And the major problem with digital sound, which they can’t get around, is that the majority of the bits are concentrated at the loud parts of the music. In other words, the first 10 or 20 dBs of the music has quite a few bits, but as the music goes down a level, the resolution goes down and down and down, which is the audio equivalent of being out of focus. So that’s why it’s very difficult sometimes to mix digitally on Pro Tools or anything like that, because you just don’t have enough information, you don’t have enough bandwidth. Unless the signals are loud, they get prioritized by loudness, you see? The actual definition of a signal decreases as it goes down, which is kind of crazy, because the ear has the reverse function. In other words, the Fletcher-Munson curves, which are the equal-loudness curves of the ear— your ear perceives frequency response at different sound pressure levels. And the softer it gets, the more treble it needs, right? Which is exactly the reverse of what digital gives you. So, you know, it’s one of those things. That doesn’t mean that you can’t take a recording that’s mixed perfectly in analog, and commit it to digital once. Many albums sound fine as a CD, but the actual definition and amount of detail digital provides is not really that great.

What are you looking towards as the next development in pedal design?

Well, I’m looking forward to—I cannot see any reason why when somebody plays a guitar riff that the whole guitar riff should have the same sound. Why should the front of the guitar riff have the same sound as the rear of it? I believe in more dynamics in the music, more player control, anything to impart to the listener that they are hearing a human performance. I’m not a believer in looping, because I believe that someone playing something ten times in a row is far better than hearing them play it once and having it looped. It’s more interesting and the public can immediately hear some of it is in the performance. It’s perceived as not being exacting, and I think that with instruments like the guitar, it’s nice to get that input. And obviously, I mean, isn’t that one of the reasons that people pick the guitar up?

As opposed to sequencer, yes.

And, really, I want people to have fun while they’re playing. Don’t go out and buy a piece of equipment and imagine that you can play like someone else. Don’t buy into that. It’s nonsense. I don’t follow anybody—I don’t want to be influenced in the wrong way.

A look at James A. Olson''s 30th Anniversary Model


Luthier James A. Olson performs every aspect of guitar construction and has been honing his reputation as a fine flattop maker since 1977. Known for his custom tooling and high profile clients like James Taylor and Phil Keaggy, Olson’s starting price for a custom guitar is $12,500. He currently produces about 40 guitars a year with a wait time of about nine months.


The guitar pictured here is one of two Anniversary Models Olson produced to celebrate his 30th year of guitar making. Identical except for one model having a cutaway, the guitars have cedar tops and “special reserve” Brazilian rosewood backs and sides. They feature Brazilian and paua shell rosettes, old growth Brazilian rosewood neck laminates and WBW purfling. These Anniversary Models also feature fossilized ivory nuts, saddles and bridge pins. This model features special fingerboard inlays by Larry Robinson. It sold for $35,000.

olsonguitars.com