PAiA vocoder - was NE570 book from MAP

[jhaible]

> Although the original design is a good one, I would highly recommend that
> anyone considering this design implement the modifications suggested by
> Scott Lee of PAiA.  I built one of these without mods and then later
> installed the modifications (consisting of 4 chips with op amps and a few
> resistor changes).  In my opinion, the changes make this a better design.
 
> I still find the best method to get the most realistic vocal sounds out
of
> this machine is to run the modulating signal (vocals) through a graphic
EQ
> before the input of the vocoder.  Tweaking of the graphic EQ and levels
is
> the key to good performance of this machine (and most vocoders).
> Kudos to Scott for his mods to this already fine machine at such a
> reasonable price.
> Larry Hendry

When I built mine (I didn't know about Paia at all, I got the circuit from
the
Keyboard mag), I made a few changes to the circuit, and included level 
potentiometers for each channel. I have made a PCB (16cm x 10cm)
for the vocoder, including the potentiometers that were directly soldered
into the board. These were special pots with a mounting bracet (the ones
MAM used to use for the old version of their line mixers), but you might 
find other potentiometers that fit in as well.
Maybe I have the films around somewhere still ...
Interested ? John ?

JH.