[sdiy] Pro One CEM3340 Sync magic

[cheater cheater]

Really cool discovery. How does it work exactly? Do you know if any
other synths used that method?

Cheers
D.

On Sun, Apr 18, 2010 at 03:03, MTG <grant at musictechnologiesgroup.com> wrote:
> I had an interesting discovery this weekend (for me anyway). As I'm sure
> many of you know, the Pro One has a single (free-running I call it) LFO and
> this lone LFO also drives the sequencer/arpeggiator.  While working on my
> "replacement CPU" I noticed, that while the LFO was free running, it would
> always sync to the user when they first played notes with the Arp on. That
> is, the first note would sound immediately and then the LFO would clock the
> next note one LFO period later. My initial attempts at duplicating the
> arpeggiator resulted in no note sounding until the LFO "came around" to the
> proper edge used to clock the notes. So I'm thinking, how the hell do they
> reset the LFO to the user?  Low and behold they used a rather clever method
> of squashing the triangle wave of the 3340 which resets the LFO. This seems
> to be somewhat undocumented since the part has other pins for sync. Anyway I
> guess it's more well  known to others, since today I found a mention of it
> in this thread:
>
> http://electro-music.com/forum/post-176134.html
>
> GB
> www.musictechnologiesgroup.com
>
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