Thx Laurie
The closest example I can put next to this phenomenon is the "accent"
feature on the Roland TB303, this sets a fixed "bump" on filter and vca that
, like you say, superimposes on the actual envelope curve.
I think you're right about the addictive vcas....by graphics and keeping in
mind of a possible de-calibration of the Mboards I analysed the ORGAN1
preset...why this? Because it features a squared vca envelope ( A=0 D=0
S=high R=0), no velocity nor aftertouch.
Considering the decalibration and the exponential CV of the touch response I
could note that:
at vel=64 there is a bump of around 2-3dB
at vel=127 the bump jumps over 6dB
These values are the deltas between the bump peak and the actual sustain
level.
About filters...I don't think they are the VCOs to be limited, you can teach
me that the iG VCOs have a huge bandwidth , expecially focused on high
frequencies...anyway, to be more precise the lowest value I get is around 16
or 16.5 KHz ...
One other thing I've noted: the Sustain Level of VCA EG is ∗not∗ flat !!! By
a graphic response there is a very smooth curve lasting around 2seconds with
a peak of 3dB on the real sustain level...why is that?
Thx again. Other comments welcome!
M
----- Original Message -----
From: "laurie" <laurie@...>
To: <yamahacs80@yahoogroups.com>
Sent: Sunday, April 30, 2006 8:06 PM
Subject: Re: [yamahacs80] "bump" from the envelopes- higest cutoff
> I believe the amps are additive.....if you have an eg at max amplitude
> and add velocity or aftertouch ...they increase over the top sustain
> level.....As I remember,.if your eg is set all the way down
> (shortest)the velocity seems to increase the initial level that the
> envelope starts at ...thus the bump from the fastest attack/decay times
> would be the full range of the fastest envelope with 0 sustain
> superimposed on top the initial level set by velocity......
>
> With respect to the filters.... is it the filters which stop at 12k or
> is it the oscillators....
> We would need to run some external sources into a m card to really see,
> however I do recall hearing some really high pitched frequencys as I was
> poking around with the trim pots ov which I collected no samples.....
>
> Max Fazio wrote:
>
> > Hi guys
> >
> > Some more analyses on the bump : I have noticed that the bump is very
> > likely a product of the envelope itself . By measures it should be
> > around 60ms (50ms clip +10ms decay) and its amplitude should be equal
> > to the top sustain level for VCA and maximum cutoff point for the
> > channel filters; it relates to both Filter EG and VCA EG.
> > By the way , I have the feel that the highest cutoff you can reach
> > with the channel filters controls is NOT 25KHz but rather something
> > around 12KHz. This results from an FFT ( wav file: 32bit/192KHz ;
> > FFT:welch , 65K harmonics, 70dB amplitude range) of open LPF or HPF
> > without resonance ; my guess is that can relate either with the EG and
> > the master Brilliance control, the former to prevent an excessive
> > excursion of the AL at high cutoffs and the latter to allow some
> > further modulation space .
> > Anyone can enlighten me about these statements?
> > Please dont' leave me without an answer........ :-(
> > M
> >
> > [Non-text portions of this message have been removed]
> >
> >
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