Weekend VOCO-BOX mp3!

[Vsat]

Fun with OTA's:

http://media.putfile.com/Voco-Box_1

(mp3 hosting courtesy of www.putfile.com)

Cheers, Mike

[Transmogrifox]

Pretty cool sounding effect.  Makes me think you could do a lot with it.  Is there some ring mod in there or is that just filtering?

[Alex C]

That sounds great!  I especially like the "yai yai" sounds near the end. Can you tell us more about this curcuit?

[Marcos - Munky]

Cool!!! Wat about more info about the circuit, and a schematic?

[Mark Hammer]

Nice.  What sort of filter/s?

[Vsat]

An old project.... a speech synthesizer consisting of 3 voltage-controlled state variable filters with a microcontroller that stores sound parameters and sends fc and Q control voltages to the individual filters, so it can speak (built-in vocabulary of several words and sentences) when you push the pedal down. Microcontroller board not finished yet so just having fun with LFO and knob tweaking 
Used LM13600 in the filters.
Cheers, Mike

[Marcos - Munky]

Do you have a schematic/photo of the actual unit?

[Dave_B]

This sounds similar in concept to R.G.'s Sing Wah article. 
http://geofex.com/Article_Folders/sing-wah/sing-wah.htm

Very cool, Vsat!

[Tim Escobedo]

SDIYer Jim Patchell did some circuits for formant filters inspired from some old Bell Labs junk he bought second hand. His circuits tend to be very complex, and suited for standard modular synthesizer rigs. But the ideas are applicable to simpler BP filter applications.

http://www.oldcrows.net/~patchell/vocalfilter/vocalfilter.html
http://www.oldcrows.net/~patchell/synthmodules/vocalfilter.html

The latter page has some amusing examples of the formant filters mated with a sequencer.