Change guitar played note, is this possible

[arma61]

Hi all, what I mean is : I play the note G on the guitar (any string) and the "FX" produce, and you hear, a note D (or any other note higher/lower), is this possible ? is this DIYable? thx for helps
Arma61

[Seljer]

it is possible, but its not really DIY-able

take a look at the Digitech Whammy, Boss PS5, Electroharmonix HOG.... a lot of the multieffect units also have a pitch shift effect in them too (even the cheapo zoom things, but sound quality obviously isnt amazing)

[studiostud]

Easy DIY solution.  Get a capo.

[petemoore]

  With 'another string' next to your G, tuned to 1/5th .
  Yupp...not too hard, I made a really wide neck 6 string into an 8 string guitar, ugly but cool too.

[arma61]

thx to all, I'll try to explain better my request; I'm working at an FX using IC SAJ110, the original project (an old one) seems to produce from a given note 3 different notes 1) on the same octave, then 1 on the lower octave and one on the higher octave, all notes can be mixed by 3 pots. So I wish I could have other 2/3 notes (there are still pins not used on the IC)  "de-tuned" from the original in order to have a sort of "second voice" to the solo note played. I know multieffects do that, I have a Korg Pandora PX.. (not able to seel it to anybody!!), but I'm building my own pedalboard (you can see picture of it here in the forum), and I would like it to be all DIYed (at the moment only 2 FX DIYed). CU

[petemoore]

   You can look at how analog octave effects double the frequency of wave peaks by splitting them into + and - sides, then fold them over to produce two peaks where one was [for every + and - signal swing]..hence the 2x or 'doubling' effect.
  This is 'messy' but analog Octave users like the 'dirt'....the signal must have it's peaks clipped [like distorter does] before the FWR can invert the peaks.
  Probably not the best explanation but by boosting, splitting, FWRing, a relatively simple analog circuit can produce doubling of the fundamental frequency, [and other 'hash'. It's not creating a 'new' frequency, it is simply adding' a peak between any peaks in the signal...doubling.
  So I wish I could have other 2/3 notes (there are still pins not used on the IC)  "de-tuned"
  ..De-tuned = very difficult analog [IIUC] or digital...
  notes of different pitch frequency have.
  'For every peak, have two peaks' doesn't produce anything except doubling/octave, hash, and 'third notes', everything is relative to the fundamental [input] frequency.
  Unless a breakthrough is made while I'm typing...lol.
  Producing a waveform which has little in common with the input frequency...the math and algorythms are a *bit more complicated...2/3rds for example, which is two peaks per three peaks [if you graphed the fundamental and 2/3rds octave] is probably easiest done [or the only way?] using a tone generator or oscillator to produce the 2/3rds tone.
  Getting the TG or oscillator to 'decide' what is 2/3rds and make that happen is another matter I don't really understand.
  Perhaps tap the fundamental [input] and make 'something which reads only every 3rd positive waveswing peak [don't ask me how], and have that somehow cause the oscillator or TG to make an output which is 2 +peaks per every 3rd peak of the fundamental peak which was 'read'.
     and I'm sure someone might tell me what I just typed is a POC...I don't know how 2/3rds note [or other non 2x tones of fundamental] producing effects actually do it...I'm just rambling about how complicated I think it might be.
  You need a whole nuther waveform, at a completely different frequency, that is alot of 'selective reading' of input, a whole lot of math, then a very precise controller of 'something which produces the 'unrelated to fundamental frequency' tone.

[Mark Hammer]

Read the review of the A/DA Harmonizer pedal here - http://hammer.ampage.org/files/Device1-4.PDF - especially the part about how many chips are part of the design, and I think you'll have some idea of how unfeasible and impractical an analog attempt at a harmonizer can be.  Spend some money on a Zoom pedal or equivalent with harmonizing option.  You may not like the rest of the tones the pedal produces, but it will be worth it just for the harmonies and lack of headaches.

[arma61]

Ok thx to all of you guys for clear (or not clear to me!) explanation, that's not for me I understand it, Project abandoned!!!, at least the pitch change. I'll stick to the oroginal basic project.