Emu XL-7 & MP-7 User's Group

Awesome thread! Thanks.
Mark
--- erik_magrini@... wrote:
> Huge, huge thanks man!
> 
> rEalm
> 
> 
> 
> 
> 
> "Aaron Eppolito" <synthesis77@...>
> 03/25/2004 12:20 PM
> Please respond to xl7
> 
>  
>         To:     xl7@yahoogroups.com
>         cc: 
>         Subject:        Re: [xl7] Re: How do I make
> my bass line "drop"??
> 
> 
> --- erik_magrini@... wrote:
> > Do you think you could explain your thought
> process behind using
> > each one of those modulation options?
> 
> Sure.  I'm doing this off the top of my head so I
> apologize if I'm not
> right with something here.
> 
> MIDI N   -> Quantize  +75%
> --------------------------
> Quantize divides the input signal into ~16 parts at
> 98% input.  For
> example, given these inputs, you'll get this output:
> 0-7 in   - 0 out
> 8-15 in  - 8 out
> 16-31 in - 16 out
> etc.
> 
> Since we wanted (or at least I wanted) an octave
> drop, I set it to 75%
> (16 steps times 75% = 12 steps).  I'm actually
> oversimplifying here
> (it's actually 17 steps, and you want 13, but it
> rounds up...) but
> trial and error gives the right value.  Hook it up
> to something and
> count the steps.
> 
> Quantize -> Fine Pitch -6%
> Quantize -> Pitch     -50%
> --------------------------
> Now that we have a stair step input signal in
> response to the
> continuous input, we can route that to pitch. 
> Normally to get an
> octave on the XL-7, you would route the controller
> to Pitch at 38% and
> FinePitch at 6%.  Yeah, I know, why the previous
> engineers didn't
> choose a round number (like 50% to Pitch = one
> octave) I don't know,
> but that's the way it goes.  Anyway, 50% here gives
> us an octave
> because we already multiplied the input by 75% (hey,
> whatdya know, 75%
> * 50% = ~%38) so we route the quantize to Pitch and
> Fine Pitch (now
> that I think of it, that 6% probably isn't right in
> this context).
> 
> MIDI N   -> AmpVol    -30%
> MIDI N   -> FiltFreq -100%
> --------------------------
> These two cords simply drop off the volume and Fc as
> the drop
> progresses.  This is just to model how a bass guitar
> loses volume and
> more so brightness when you loose clean contact with
> a fret.  (fingers
> absorb high frequencies much more than frets do).
> 
> Now for the hard stuff:
> I just realized I wrote this up wrong.  The
> following cords are what I
> had in my XL-7, the ones I posted in the previous
> post are not.
> Quantize -> Gain4X   +100%
> Quantize -> Lag0In   +100%
> Lag0     -> Gain4X   -100%
> Gain4X   -> Abs      +100%
> Abs      -> FiltFreq +100%
> 
> 
> So anyway, here's a breakdown of what this chunk of
> cords does.
> Quantize -> Gain4X   +100%
> Quantize -> Lag0In   +100%
> Lag0     -> Gain4X   -100%
> --------------------------
> This creates an approximate differentiator.  For
> those who didn't do so
> hot in Calculus (like me; calc kicked my ass) a
> differentiator creates
> a signal that is proportionate to how quick the
> input signal changes. 
> For a real world example, Acceleration is the
> derivative of Speed, i.e.
> acceleration is big when you start increasing your
> speed quickly.
> 
> By subtracting a lagged quantity from the original
> quantity, you get an
> approximation of how quick you're changing.  In our
> case, since we have
> a stairstep input (by virtue of the quantizer) each
> step has a huge
> acceleration giving us an impulse at each step. 
> Differentiators are
> *very* useful in synths.  Try using one to increase
> chorus when
> changing pitch to get a symphonic type sound.
> 
> Gain4X   -> Abs      +100%
> --------------------------
> Since the differentiator produces signed output
> (positive when the
> steps go up, negative when the steps go down) I'm
> running it through an
> absolute value so that no matter whether you're
> sliding up the
> fretboard or down the fretboard, the pulse is
> positive.
> 
> Abs      -> FiltFreq +100%
> --------------------------
> And finally, do something with the differentiated
> signal.  The above
> cord "pokes" Fc at each fret.  It's not terribly
> exciting.  Better
> would be to copy all these cords to a duplicate
> layer with a buzzy
> sound and target AmpVol to increase the level.
> 
> Okay, that's my synth lesson for the day.  Your
> assignment?  Go program
> something!  Enjoy the fact that your ROMpler is more
> of a synth than
> some VAs!  =)
> 
> -Aaron
> 
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