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What first to put in effect chain (order from guitar cable input) -- distortion or effect processor?

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If by effect processor you mean modulation effects, reverb and delay, the standard sequence would be distortion -> effects. Distortion after delay or modulation is a bit like using one distorted amp with two guitars at its input (remember the old days?) It creates a lot of intermodulation products which can sound annoying. However, try everything and you might find certain sounds for which you prefer to have the distortion after other effects.

One effect which is very often used before the distortion/overdrive unit is a wah-pedal. This mimics the use of a wah with an overdriven amp, where the wah also comes first, and then the signal is distorted by the amp.

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In particular, putting wah before distortion changes the characteristic from single-resonant-peak lowpass on a high-bandwidth signal (as typical for many synths) to complex morphing of a peak with harmonics and no real high cut (somewhat more like human voice). Both FX orders have their benefits and drawbacks. – leftaroundabout Mar 6 at 1:14

Here's an article that gives some plausible answers, though I must warn you that just about every conclusion is followerd by a list of exceptions! I like his mnemonic for the order of effects, reproduced below. (For "overdrive" read "distortion".)

http://www.justinguitar.com/en/GG-050-EffectsPedalOrder.php

table

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One rule of thumb is that effects placed later in the signal chain (or, if using a multi-effect, blocks placed later in the chain) will often be the ones that play a greater part in dictating your overall sound. So while guitar → distortion → reverb may sound spacious and ambient, with clean reverb applied to distorted guitar, guitar → reverb → distortion can cause the reverb to be distorted too, giving a more 'grungey' overall sound (which can be good for surf guitar, for example). So while you could experiment with distortion after other effects if you want a very distorted and grimey sound, you're more likely to want to have other effects later if you want to hear a cleaner version of what they do.

Having said that, this consideration depends on how much distortion you are applying. If you are (for example) only using the multi-effects to add a small amount of delay, and the delayed notes are much quieter than the 'clean' signal, there might not be much perceived difference as the delayed notes on their own wouldn't drive the distortion into clipping.

One situation in which you almost certainly want distortion first is if you're using a traditional style fuzz that 'expects' to have something with a relatively high output impedance - i.e. the guitar pickup - before it in the signal chain. Some of these will sound very flat, or self-oscillate, if they're plugged into the output of a multi-effect (which will generally have much lower output impedance).

A situation in which you might want to consider having the distortion later would be if you have it set to output a very high output level which your multi-effect cannot handle (for example if it clips, or activates some auto-gain reduction which chokes your playing dynamics).

Sometimes the pre-amplifier part of your guitar amp will induce its own distortion, *so that a part of your chain is effectively → distortion anyway*. The standard way around this is to use your other effects (perhaps delays, reverbs, phasers) in the effects loop of the amplifier (though you may need to ensure that your effect processor can handle the level of signal in the loop).

Some multi-effects processors can be configured so that you can place an external distortion unit in an insert point in between the 'virtual' effect blocks of the multi-effect. This might be useful if you want, e.g. wah (from multi effect) → chorus (from multi effect) → distortion (external) → reverb (from multi effect).

See also Why does pedal order matter?, although that is not specifically about distortion.

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thank you, Marshal Drivemaster distortion to Korg processor chain has appeared to produce less noise, I was afraid to burn out effect pedal with overdrived signal – VassiaAlk Mar 6 at 9:03
    
@VassiaAlk don't worry, you won't burn any pedal out by plugging another pedal's audio output into it. – topo morto Mar 6 at 9:35

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