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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Gray cords and soft sync on the G2
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mosc
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Joined: Jan 31, 2003
Posts: 18240
Location: Durham, NC
Audio files: 224
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PostPosted: Fri Apr 23, 2004 6:01 am    Post subject: Gray cords and soft sync on the G2 Reply with quote  Mark this post and the followings unread
This is a good post from Dave Peck on the NM list. I thought it worth cross posting here...
Quote:

On the NM/Micro, there are two different 'classes' of
oscillators - Master oscs and Slave oscs. A Master osc
has pitch mod inputs, including a kybd tracking on/off
switch. Slave oscs have tuning knobs but no pitch mod
inputs; you connect a grey Master/Slave patch cord
from the 'Slave Out' jack of a Master osc to the 'Mstr
In' jack of a Slave osc, and the slave osc follows the
pitch of the master, plus any detuning you set using
the tuning knobs on the slave osc. This saves DSP, and
allows you to easily apply the same pitch mod signals
to multiple oscs.

On the G2, all oscs are Master oscs, as they all have
one or more pitch mod inputs and don't need to be
connected to some other osc to track the keyboard or
process pitch mod control signals.

So the G2 doesn't need master/slave grey cables. So
why would someone be disappointed that it doesn't have
them? Ah, good question.

It turns out that you can use the master/slave grey
signals for all kinds of weird things that Clavia
never originally intended. First, it's important to
understand that the master/slave input on an NM slave
osc is not the same thing as a pitch mod input. For
example, when a signal at a pitch mod input drops to a
level of zero, the slave osc will produce whatever
pitch is set by the tuning knobs. But when a
master/slave signal at a MSTR IN input drops to zero,
it causes the osc frequency to drop to zero - the osc
slows down until it completely stops oscillating, and
produces a steady DC level. And here's the important
part - when the signal at a MSTR IN input goes
NEGATIVE, it causes the osc to start oscillating again
- BACKWARDS. Meaning a down-ramp sawtooth turns into
an up-ramp sawtooth. This can be used for all sorts of
cool things, most notably "soft-sync", which is when
you make an osc flip directions at an audio rate.

However, the G2 has a way to do this, using the FM
inputs on some of the oscs, setting the selector swith
at the coarse tune to "PARTIAL" and turning the coarse
tune all the way down to 0 Hz. And the G2's "master
osc" can be used to control multiple oscs from one set
of pitch mod signals (not master/slave signals) so you
still have the convenience of that feature, too. So
the G2 still allows you to do all of the old
master/slave tricks, we just didn't know that at
first.

Dave Peck
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Rob



Joined: Mar 29, 2004
Posts: 580
Location: The Hague/Netherlands/EC
G2 patch files: 109
PostPosted: Fri Apr 23, 2004 1:43 pm    Post subject: Reply with quote  Mark this post and the followings unread
There is some more indepth explanations here:

http://www.clavia.se/nordmodular/Modularzone/Theory%20and%20history.html

and here:

http://www.clavia.se/nordmodular/Modularzone/FMsynthesis.html
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