AW: AW: AW: VCO-1C #2

[Haible Juergen]

	>I don't know for sure - I don't have the schematics for the
Pro-One. 
	>I looked over the circuit board briefly, and I couldn't see an
external
	>transistor, so I assumed it was using the built in sync function.
	>Anyone with the schematic know for sure ?

I don't have P1 schemos either, but I asume it's the same as
in the P5 (and the OB-Xa, OB-8, and even shown as an option
in the 3340 data sheet).

	>The oscillators in my modular are also 3340s and their sync sound
is pretty
	>much the same as the p1, with minor variations between the soft and
hard
	>sync options, but no exciting sync noises to be had compared to the
moog.

	>Is the sync on the Syrinx crap too ?

Speaking of crap in the Syrinx is sacrilegious - but yes, it *is* crap, IMO.
That is, if it's your synth's *only* hard sync. It's quite nice as an
option,
though - sonically somewhat between ordinary hard sync and soft sync.

A (crappy (:->) ) drawing with several 3340 sync types can be found at
http://www.synthfool.com/diy/hj2vco.gif
I have a 6-position switch that selects separate sync modes. You
can clearly see the external transistor for the P5 etc. style sync.
I have *never* really understood how it works - note that the transistor
is *not* connected to the VCO's capacitor, but to the buffered capacitor's
voltage. Somehow it discharges the cap thru the buffer (?).

I think this sounds *similar* to ordinary hard sync at least. But then
again I'm used to the sync sound of my OB-8 and Prophet 5 ...

Does anybody know what the Roland sync circuit (JP6 and MKS-80)
does ? The must have had some reason to use lots of transistors
instead of a single one. Is this an improovement over the P5
style sync, or did they just not know the one-transistor trick back
then ??

JH.