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[Haible Juergen]

	>The E&MM Spectrum synth (schematics are on the web somewhere)
also has a
	>3340 with a separate sync circuit, and the article text
explains why.
	>Basically the 3340 doesn't have 'real' sync. The incoming sync
pulse
	>forces the direction of the triangle wave to reverse but
doesn't reset
	>the voltage level. 
	>According to the E&MM article this doesn't sound as good.
	>
	>The spectrum circuit adds 2 sync modes - one that resets the
wave to its
	>most negative point, the other sets it to halfway. Also the PW
output
	>from the synchronising oscillator is used to control how often
the
	>slaved oscillator is synced - if that doesn't make sense have a
look at
	>the article. If you can't find it it's on my home PC.
	>
	>Colin f 

The internal hard sync is a little strange indeed, and doesn't sound
like "ordinary" hard sync at all. But very few commercial synths used
it anyway (the Synton Syrinx being one exception). They added one 
external transistor instead (I think this is in the 3340 data sheet as
well),
and the result is very similar to "ordinary" hard sync.
I have done some quick measurements once, but not in depth, I have to
admit. 
So, is the external transistor method 100% equivalent, or only similar ?

JH.

PS.: If you already have the article in electronic form, please send me
a copy!