[sdiy] Pro One CEM3340 Sync magic

[Simon Brouwer]

Op 18-4-2010 9:46, ASSI schreef:
> On Sunday 18 April 2010, Simon Brouwer wrote:
>    
>> Is it correct to say that the CEM3340 "sync" is not synchronization
>> in the true meaning of the word, as it does not lock the frequency
>> of the sync'ed oscillator's output to that of the syncing
>> oscillator, as a saw-core hard sync does?
>>      
> It does, just not for all combinations of frequencies or more
> precisely not the same combinations than hard-sync.  Just look at what
> happens when the master oscillator runs slower than the slave in a
> hard-sync configuration.
>    

In a saw core hard sync the output of the slave has always the same 
frequency as that of the syncing signal (or an exact multiple of it, in 
case the slave happened to have that free-running frequency already).
So the pitch is determined by the master, and you can change how the 
signal sounds by varying the slave's free-running frequency.

In the case of the CEM3340 hard "sync" the core is not reset but its 
state is changed. The pitch (periodicity) of the resulting signal would 
generally be lower (longer) than that of the master. I would expect it 
to be more useful for non-pitched sound effects similar to ring modulation.

I used CEM3340's in a home-built synthesizer more than 25 years ago but 
I actually never used the sync feature so I have no idea how it sounds. 
Are there any sound samples around that we could listen to?

-- 

Vriendelijke groet,
Simon Brouwer.