Just think about what is happening when you hit a low key on the keyboard (a
low voltage comes out) and then a high key ( a high voltage comes out). Now
hit the low key again...
That "low / high / low" voltage is the beginning of a very low frequency
pulse wave ("square" only if your timing is perfectly even).
The 'glide' that the lag adds to that for normal 'portamento' use is to slow
the transition, sort of "angling" those up and down transitions.
There's conceptually no difference between changing the slew rate, as it is
often called, of that hand-generated pulse and one coming out of an LFO or
VCO. (The only difference would be if the lag processor was range-limited to
a low frequency, but you know with MOTM modules that ain't gonna happen.)
So essentially, that's how you can use the lag as a type of waveshaper.
Put in a pulse wave (LFO or VCO) and add some lag, and you will get
something approaching a triangle, and with more, a sine wave (a lag is
essentially a special type of lowpass filter after all).
Put in a pulse and adjust ∗only∗ the up or down, and you will start to get a
waveform approaching and then becoming a sawtooth / ramp wave.
And of course, the lag is voltage-controllable, so all of this is under VC.
You can morph from one to the other. Try setting up one of the above sounds,
but mult-out the output and feed some of it back into the CV for the lag,
see what you get!
-----Original Message-----
From: John [mailto:
jpyyz@...]
Sent:Thursday, 26 April, 2001 1:55 AM
To:
motm@yahoogroups.comSubject:[motm] VC Lag
I have been searching the archive for about the last hour and
stumbled upon a post made over a year ago about the MOTM Lag
processor. It says it can be used for things other than "glide",
like "turning pulse/square LFO's into bizzare shapes". So how does
the Lag do this? What do the up, down, up/down and shape controls do
when running an LFO (or audible audio for that matter) through the
Lag?
John Parks
> Other things to use it for:
> a) turn a GATE into a AR envelope generator
> b) turn a pulse/square LFO signal into bizarre shapes (linear
setting works
> best)
> c) it's a natural 6dB low-pass filter
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