MOTM

Thomas,

From a catalog of another synth maker that makes a dual Schmitt Trigger:

"The DUAL SCHMITT TRIGGER is similar to the Dual Comparator, except that it
has been optimized for squaring up audio signals.  The Schmitt Trigger is a
single-input comparator with hysteresis.  Hysteresis means that the
switching thresholds are different for an input signal depending upon
whether it is going up or down.  This feature can be used with an envelope
and VCA functioning as a noise gate to reject low-level background noise in
audio applications. 
The Schmitt Triggers can be used for level detection, plus they have a
function unique to the module: both sections of the module can be used as a
"set-reset flip-flop".  Essentially, this is a memory element.  A pulse or
level into the SET input sets the R/S output high.  This output will stay
high independently of the activity at the SET input.  It is reset to zero
when the RESET input receives a pulse or sufficient level." 

A lag processor and a slew limiter are the same in my mind but there may be
subtle differences that I'm not aware of and yes, it will do portamento when
applied to keyboard CV.  Search the archives for discussion of exponential
vs. linear portamento.  Exponential is much more musical IMHO since it
matches the way singers tend to "slide" into notes.

There has been mention of joysticks it the past.  I love 'em!!  They can be
hard to find these days but a few manufacturers make them.  Joysticks have
more mechanical issues with their development than anything else.  An
alternative would be to take a MIDI keyboard with a joystick, like the Korg
M1, and use a MIDI/CV converter to send the voltages where you want.
Unfortunately, most of these joysticks are spring loaded.

	Eric

> -----Original Message-----
> From: thomas white [mailto:djthomaswhite@...]
> Sent: Thursday, January 27, 2000 12:27 PM
> To: motm@onelist.com
> Subject: [motm] Modular Growth Required
> 
> 
> From: "thomas white" <djthomaswhite@...>
> 
> Hi everybody,
> 
> Can anybody tell me exactly what a Schmitt Trigger does? 2nd question:
> Is a lag processor similar to a slew limiter? I am after 
> portamento in a 
> hungry way. Has anybody ever mentioned a joystick or other 
> control voltage 
> source module? Would be great for shifting audio gears during 
> stage use or 
> is a one on synth trance out session! Thanks for help,
> 
> Thomas White "T-Dub"
> (*my friends call me this, short for TW and my shameless 
> appreciation of 
> tape echo and dub music technologies.)
> 
> 
> 
> 
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