Octave Down?

[DDD]

OC-3 IMHO cannot track multiple notes. It seems there is an additional LF filter inside it and an advanced circuitry intended to mix wet and dry signal. So by picking one of the bass strings of a chord and then picking the voice strings of the chord one can play "dixieland".
I haven't seen the OC-3 schematic, but I've tried the above method by myself. Works great!

[jmusser]

Since this post first came out, I've build Joe Davisson's Shoctave Harmonizer, and it does a wonderful job of doing a single octave down. Just don't try chords with it! until I saw this schematic, I had always thought the a down octave pedal was way out of my league to build, from a lot of the schematics I've seen. I'd say, most of them are too intense. This one was recommended by RDV, and once I heard his sound sample, plus saw the 5 transistor schematic, I had to try it. I have a review on it, which you may have read since the time of this initial posting.

[soggybag]

There was an issue of Stompboxology that covered subharmonic synthesis. It  had some very interestring things to say about frequency dividers. In the issue Mr Boscorelli talks about dividing the input signal into 6 frequency bands then subdividing each of these and mixing them together, then mixing the whole back in with the original signal.

The issue had schematics for:
Subharmonic generator for your stereo
Subharmonic generator for Bass
Subharmonic enhancment for voice with selectable frequency ranges
Octave divider distortion box for guitar

It looks like all of the projects are based around the 4013, which seems to be the divider of choice for most frequency divider projects, and a handful of opamps and transistors.

It's all a little over my head, but he seems to make a distinction between Subharmonic synthesis and frequency division. Though it seems the parts involved in creating the effect are very similar.

I think I will have to reread this issue again more closely.

[puretube]

[SOT]:
http://www.sonicstate.com/news/shownews.cfm?newsid=2279