[A6] all jacked in

[Tom Moravansky]

> > You sure the Syrinx is parallel?  I seem to remember that cranking any
> > of those filters too much really cut down the Syrinx sound.  
> > I know the
> > final LP filter sounded like it was in series after the 2 BP filters.
> > I'll have to power up the Syrinx tonight and check (or look at the
> > schematics...)
>  
> If it does formants, then it must :-)  Think of it this way.  Put one PB
> filter at 20Hz, another at 4000Hz and another at 10kHz in series; they'd
> filter each other out and you'd end up with nothing.  I suppose in series
> they could still be useful if their cutoffs were sufficiently close, but
> everywhere I've heard of formants, its been parallel filters.
> 

Ummm,  one cup of coffee later, .....

yeah that makes sense.  I was thinking their slopes were
gradual and overlapping.

> According to:
> 
> http://www.synthmuseum.com/synton/syrinx01.html
> 
> the filters can be patched in multiple ways...
> 

In actual fact, it's the overall routing that has 4 different
possibilities, mainly in whether the oscillators go to each filter,
where the noise and ring mod are routed, and whether the LPF input
is fed in parallel with the peak filters or just from the peak filter
section output.

If I bothered to look a bit, I have a blank Syrinx patch sheet
on my site:  

http://www.synthservices.com/sheets/syrinx.jpg
http://www.synthservices.com/sheets/syrinx.pdf

(note that the .JPG is scaled for printing, not web viewing, so lots of
scrolling is required - or save it locally and bring it up in
Photoshop).  The .PDF version fits on the screen better.