Got Pitch (shifting)?an RP355 with my patch set is an example of how much weight and power a low octave or double octave can add to the harmonica's basic tone. This kind of rock material isn't "traditional" roots music, of course, but you can use the same kinds of sounds to fill the role of a tenor or bari sax in a blues band. I'm not talking about imitating a sax; I'm talking about filling the same frequency range with something that has a similar reed-instrument sound. Even a traditional blues band can find a use for that. (Certainly some of the ones I've played with have.) Wade Schuman's work with Hazmat Modine is an outstanding example of how to use a pitch shifter with harmonica. Wade uses an Electro-Harmonix POG, a device that generates one or more pitch-shifted octaves simultaneously, including low and high octaves and double octaves. The Electro-harmonix HOG, a more complex (and expensive) device, adds low and high 5ths, octaves with added fifths or thirds, and so on for a total of up to ten simultaneous pitch-shifted intervals, which makes for a pretty big roar when you crank it up. The POG2, Electro-harmonix's latest version of the POG, sells new for over $325. As an alternative, consider any of the Digitech RP series of devices coupled with my patch set for Digitech RP. These units can generate one pitch-shifted voice at a time, which can be set to any interval from two octaves down to two octaves up, and can be mixed in any desired proportion with the original voice. In the RP255 and higher models in the RP series, either the pitch shift interval or the pitch shift mix can be put under footpedal control for real-time manipulation of the sound, and can be combined with a range of other FX that include wah, delay, reverb, and distortion. Even the RP155, which sells for less than $100 new, produces an excellent pitch shift effect, which makes it one of the lowest-cost pitch shifters available (not even counting the other FX in the box), and undoubtedly the best single-voice pitch shifter available in a multi-FX device in that price range. Any RP from the 255 up can use the whammy effect, which pitch-shifts smoothly within a given range, say from one octave down to normal pitch, including anything from single notes to chords, under footpedal control. (It's the whammy that creates the careening pitch shifts during the solo on "Early to Bed.") The RPs also include a harmonized shifter that will harmonize original tones with a key- and scale-consistent interval (for example, 3rds in the key of E minor); I haven't played with it much, but it's an interesting effect for tunes where you know what key and mode you're going to play in. I'm partial to the RP series devices, which in my opinion offer very high value for money given that they include so many other FX along with the pitch shifter. The Zoom G3 also contains a decent pitch shifter, though not as robust as the RP's in my opinion in terms of either basic tone quality or tracking. However, the G3 allows you to chain multiple pitch shifter modules in series, which lets you generate some complex tones that aren't possible on an RP. (By "in series," I mean that the pitch shifters run one after the other in the signal chain, so the second shifter in the series acts on the first, the third shifter in the series acts on the first and second, and so on. In the POG, the shifters run in parallel, so you can adjust one without affecting the others.) With a G3 you can generate chords from a single original note that span 4 or more octaves; for example, start with a double-octave down shift; then add an octave up, which gives us a chord that includes the original note, the same noted shifted one and two octaves down, and the same note an octave up. Add a shift of a 5th up to all that and you have a series of roots and fifths spanning four octaves and a 5th. Of course there's a certain amount of signal degradation going on with every added pitch shifter, but still, we're talking about a very big, wide sound. Better make sure you've got something bigger than an 8" speaker in your cabinet if you want to run that lineup, or you'll blow the speaker cone to bits the first time you crank it up. In any pitch shifter, the things to look for are:
Remember that a pitch shift of an octave down or two octaves down creates low-frequency pitches with loooong wavelengths, and if you do a lot of that stuff you're going to need an amp with a 10" speaker at least. If you want to do a whole lot of low end, consider a keyboard amp or powered PA speaker with a 12" or 15" woofer. I love pitch shifters. The first time I ran a harp through a Digitech RP with a low octave pitch shift, over ten years ago in an instrument store, less than thirty seconds elapsed before I picked the thing off the floor and walked it to the checkout counter. The most important effect for any electric harp player is a delay unit, and a pitch shifter is a close #2 in my opinion. It adds weight and power to any amped harmonica setup, to the point that it changes the game for the player. If you're playing anything but purely traditional styles, a pitch shifter ought to be in your rig.