[sdiy] analog pitch shifter circuit?

[synthplayer88 at spymac.com]

Thanks a lot guys, for your thoughts!!!

Does anyone know of a circuit that works well and could be built by an DIYer
without any programming? Would love to see the schematic if there is one......

I would love to go out and buy a kit or the boss pedal itself, however I am
looking to build a rack unit and it just feels like a waste(not to mention
terribly expensive) to buy serveral Boss pedals just to gut them for my DIY project.

Can anyone point out a link to BBD circuit for making a delay(if there is one)?
I am begining to get the impression that it would be a deep hole to fall into
trying to build one with good result, especially with multiple octaves......

I guess no one knows how the Boss voice transformer works or the early pitch
shifter pedal done by Boss, I think they are analog circuit......




>
>The same thing can be done using analog Bucket Brigade Devices (Hi, Harry).  
>You need to modulate the BBD clock with a sawtooth wave.  The upward-rising 
>(or downward-going for lower pitches) sawtooth wave emulates the effect of the 
>rotating tape head, effectively raising the pitch of the BBD output by a 
>constant amount.  Well, constant until the sawtooth gets to its peak and has to 
>retrace back to the bottom again...  During that retrace period, there is going to 
>be a glitch in the pitch shift.  There are a handful of different ways to 
>deal with that glitch -- for instance, you could have two BBD pitch shifter 
>circuits being modulated 180 degrees out of phase with each other and cross-fade 
>between the two with a panner/dual VCA, with the cross-fade kind of masking the 
>glitch (sort of like the aforementioned two-tape-heads idea).  There may be 
>some other workarounds, but none of them will be perfect, and most solutions 
>will probably not be very musically satisfying.
>
>Also, keep in mind that pitch shifters generally have a pitch range of +/- 
>one octave, and they usually sound pretty horrible when shifting as much as one 
>octave.  Two octaves might be technically possible, but the sound would be 
>completely distorted and very likely be unusable for anything except weird noise. 
> (and not cool weird, but the "sheesh" kind of weird)
>
>Again, someone is trying to reinvent the wheel here.  Believe me, it would be 
>cheaper, easier, more musically useful, and probably even more fun to simply 
>spend $100 and get one of those BOSS Pitch Shifter or Intelligent Harmonizer 
>pedals.  They work amazingly well, and have features that you'd NEVER be able 
>to DIY.  It would probably even be possible to modify those pedals with a CV 
>input for voltage control over the pitch shift amount -- then you'd still have a 
>nice DIY element happening to satisfy that part of your soul.
>
>Mike B.
>
>P.S. - When I ran this email through my spell-checker, I found that I had 
>mistyped the words "pitch shifter" as "pitch shiter".  I thought Harry might 
>appreciate that.
>