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  • 10 Tips for Guitar Digital Multieffects

    By Anderton |

    Get the most out of today’s digital wonderboxes


    by Craig Anderton


    Everyone’s always looking for a better guitar sound, and while the current infatuation with vintage boutique effects has stolen a bit of the spotlight from digital multieffects, don’t sell these processors short. When properly programmed, they can emulate a great many “vintage” timbres, as well as create sounds that are extremely difficult to achieve with analog technology.


    As with many other aspects of audio, there is no one “secret” that gives the ultimate sound; great sounds are often assembled, piece by piece. Following are ten tips to help you put together a better guitar sound using multieffects.


    Line 6's POD HD500 is one of today's most popular digital multieffects for guitar.





    Unintentional digital distortion can be nasty, so minimize any distortion other than what’s created intentionally within the multieffects. The input level meters help you avoid input overload, but they may not tell you about the output. For example, a highly resonant filter sound (e.g.,wa) can increase the signal level internally so that even if the original signal doesn’t exceed the unit’s input headroom, it can nonetheless exceed the available headroom elsewhere.


    Some multieffects meters can monitor the post-processed signal, but this isn’t a given. If the distortion starts to “splatter” yet the meters don’t indicate overload, try reducing the input level.




    If a patch uses many effects then there are several level-altering parameters, and these should interact properly—just like gain-staging with a mixer.


    Suppose an equalizer follows distortion. The distortion will probably include input and output levels, and the filter will have level boost/cut controls for the selected frequency. As one illustration of gain-staging, suppose the output filter boosts the signal at a certain frequency by 6 dB. If the signal coming into the filter already uses up the available headroom, asking it to increase by 6 dB means crunch time. Reducing the distortion output level so that the signal hitting the filter is at least 6 dB below the maximum available headroom lets the filter do its work without distortion.




    Speakers, pickups, and guitar bodies have anything but a flat response. Much of the characteristic difference between different devices is due to frequency response variations—peaks and dips that form a particular “sonic signature.” For example, I analyzed some patches David Torn programmed for a multieffects and found that he likes to add 1 kHz boosts. On the other hand I often add a slight boost around 3.5 kHz so guitars can cut through a mix even at lower volume levels. With 12-strings, I usually cut the low end to get more of a Rickenbacker sound. Parametric EQ is ideal for this type of processing.




    Each successive repeat with tape echo and analog delay units has progressively fewer high frequencies, due to analog tape’s limited bandwidth. If your multieffects can reduce high frequencies in the delay line’s feedback path, the sound will resemble tape echo rather than straight digital delay.




    If your pre-retro craze multieffects doesn’t have a tremolo, check for a stereo autopanner function. This shuttles the signal between the left and right channels at a variable rate (and sometimes with a choice of waveforms, such as square to switch the sound back and forth, or triangle for a smoother sweeping effect).


    To use the autopanner for tremolo, simply monitor one channel and turn down the other one. The signal in the remaining channel will fade in and out cyclically, just like a tremolo.




    Many multieffects have speaker simulators, which supposedly recreate the frequency response of a typical guitar speaker in a cabinet. If you’re feeding the multieffects output directly into a mixer or PA instead of a guitar amp and this effect is not active, the timbre will often be objectionably buzzy. Inserting the speaker emulator in the signal chain should give a more realistic sound. However, if you go through a guitar amp and the emulator is on, the sound will probably be much duller, and possibly have a thin low end as well—so bypass it. You might be surprised how many people have thought a processor sounded bad because they plugged an emulated cabinet output designed for direct feeds to mixers into a guitar amp.




    A multieffects will generally let you assign at least one parameter per patch to a MIDI continuous controller number. For example, if you set echo feedback to receive continuous controller message 04, and set a MIDI pedal to transmit message 04, then moving the pedal will vary the amount of echo feedback. You can usually scale the response as well, so that moving the pedal from full off to full on creates a change that’s less than the maximum amount. This allows greater precision because the pedal covers a narrower range. Scaling can sometimes invert the “sense” of the pedal, so that pressing down creates less of an effect rather than more.




    Some cheapo effects, and a large number of “vintage” effects, create stereo with time delay effects by sending the processed signal to one channel, and an out-of-phase version of the processed signal to the other channel. While this can sound pretty dramatic with near-field monitoring, should the two outputs ever collapse to mono , the effect will cancel and leave only the dry sound. To test for this, plug the stereo outs into a two-channel mono amp or mixer (set the channel pans to center). Start with one channel at normal listening volume, and the second channel down full. Gradually turn up the second channel; if the effect level decreases, then the processed outputs are out of phase. If the effect level increases, all is well.




    One way to enrich a sound is to double a multieffects with an amp, and mix the sounds together. Although you could simply split the guitar through a Y-cord and feed both, here’s a way that can work better.


    To supplement the multieffects sound with an amp sound, send the multieffects “loop send” (if available) to the amp input. This preserves the way the multieffects input stage alters your guitar. If you’d rather supplement the basic amp sound with a multieffects, feed the amp’s loop send to the multieffects signal input to preserve the amp’s preamp characteristics.




    Many musicians evaluate a multieffects by stepping through the presets, but you need to be aware of two very important issues. First, whoever designed the presets wasn’t you—it’s very doubtful they were using the same guitar, pickups, string gauge, pick, touch, etc. If a preset works with your playing style, it’s due to luck more than anything else. Second, presets are usually designed to sound impressive during demos, and will be loaded up with effects. Sometimes creating your own cool presets simply involves taking a factory preset and removing some selected effects, and adjusting an emulated amp’s drive control to match your playing style.


    Well, that covers the 10 tips. Have fun strumming those wires—and remember that the magic word for all guitar multieffects is “equalization.”





    Craig Anderton is Editor Emeritus of Harmony Central. He has played on, mixed, or produced over 20 major label releases (as well as mastered over a hundred tracks for various musicians), and written over a thousand articles for magazines like Guitar Player, Keyboard, Sound on Sound (UK), and Sound + Recording (Germany). He has also lectured on technology and the arts in 38 states, 10 countries, and three languages.




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    Very Informative Craig!  One thing I wanted to add is that the DIgitech GSP line has a setting in the unit that shapes the signal based on the type of amp, such as SS stack, Tube Combo, Tube Stack, etc.. that can make all the difference in the world- as these units do not come out of the box preset to work with tube amps.  The usually come with the cabinet simulators turned on, and the shaping set to direct (PA), and when plugged through a guitar amp, as you know, sounds like garbage!

    I didn't realize the part about the input levels, but have had that digital distortion (I called it digital artifacting, not realizing what was causing it) - I chased a lot of dead ends trying to rectify it, including selling off an active pickup guitar that seemed to have more trouble in that area than the others.  Now I will be checking my levels and hopefully improving my tone.

    Good times!

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