[A6] Mod 2 routing question. Please HELP!

[David Evans]

On Wed, Aug 20, 2003 at 08:33:17PM -0500, Don P wrote:
> 
> I think I understand the On Vox thing, are you saying that when On Vox
> is selected the LFO will run when the note is played regardless of
> trigger on/off settings?

  Right.  The trigger stuff is only meaningful when the LFO is set to
"ON TRIG".

> But if the mod
> is always on when ON Vox is selected, why have an on off switch when the
> Mod button is selected on each LFO?
> 

  The MOD doesn't have anything to do with the trigger but rather with
modulating one of the destinations listed on the LFO's MOD page.

> 1. I understand that PW is a modulation type, and when turned on it is
> modulating the square wave?

  It's modulating the pulse width of the square wave, yes.

> Are you saying that the LFO's can modulate a
> Modulator (PW) but can't modulate the actual wave itself?

  I'm not sure what you mean by the "actual wave itself."  The PWM
button provides a modulation destination for the pulse width and
nothing else.  The other three MOD buttons on each oscillator provide
modulation destinations things like frequency, square/pulse wave
*amplitude*, and even PWM.  In other words, if you want to do PWM
there are two places you can do it: using the PWM button and using
one of the general-purpose OSC MOD buttons.  Clearly you should
normally use the PWM button, since then you have all of the OSC MOD
routes free to use for other things.

> I previously said that LFO 2 with "On Vox" turned on modulates
> PW-SQ-OSC2
> I now discover that LFO 3 with "On Vox" turned on modulates PW-SQ-OSC1
> 

  It likely has to do with how the MODs are set up.  I just chedk out
"The Default Pgm" and, sure enough, the PWM MOD dest on OSC 1 has
LFO 3 going into it while the PWM MOD on OSC 2 uses LFO 2.

> LFO 2 has no effect on PW-Osc1 and LFO 3 has no effect on PW-Osc2.
> LFO 1 with the same settings has no effect on either Osc 1 or 2.
> 

  "The Default Pgm" uses LFO 1 for vibrato (MOD 1 on each oscillator).  The
depth of this MOD is controlled by a CROUTE from the mod wheel, so that you
only get vibrato when the mod wheel is up.

> I have looked everywhere to find where these routes are located. Do you
> have any idea why the LFO can mod one Oscillator and not the other, or
> why LFO has no effect on either? Do you think they are hard wired?
> 

  No, they aren't hard wired, that's just how the patch is set up.  You can
change the source of any MOD to whatever you want, so you can set it up
in many different ways.  "The Default Pgm" has a lot going on in it, and
it can be a little confusing.

> Thanks for sticking with me on this. This is where I was a few months
> ago and got frustrated and took a break for a while. I am right at the
> edge of discovery, and would hate to pack it in again when I am so close
> to understanding this monster of a synth.
> 

  The A6 is a rather brutal synth on which to learn, so your frustration
is rather understandable.  But once you get it you should be completely set,
even when you get a modular.

-- 
David Evans          (NeXTMail/MIME OK)             dfevans at bbcr.uwaterloo.ca
Ph.D. Candidate, Computer/Synth Junkie     http://bbcr.uwaterloo.ca/~dfevans/
University of Waterloo         "Default is the value selected by the composer
Ontario, Canada           overridden by your command." - Roland TR-707 Manual