Laurie
What I've noticed: first keep in mind of a possible decalibration of VCAs :
the most "flat" responding preset among all the 22 is the ORGAN1 : Tommy
(Priakos) applied velocity values and sent them through MIDI ; that patch
has no velocity nor aftertouch, and again between velocity=20(no accent) and
vel= 64 there is an "accent" delta that's around 3dB higher ; at vel= 127
there is an accent of about 5-6dB higher than the accent at vel=64; if you
set a panel patch or use some presets such as BASS you can notice that the
delta between 64 and 127 is around 3dB with proportional increase of volume
related to velocity;
About this "non flat" portion of Sustain level : I have to rectify my
statement: it's a 2dB peak, not 3dB.
I've noticed it with the ORGAN1 patch: trusting the manual the patch
features no influence of the Filter EG, no Attack, no Decay, Sustain level
at full , no release, no velocity and no aftertouch at all; this non flat
behaviour is constant and proportional to the amplitude ; you can note this
behaviour if you listen carefully to other similar patches with full Sustain
level such as STRINGS2 , ORGAN2, FUNKY1,FLUTE.
M
----- Original Message -----
From: "laurie" <laurie@...>
To: <yamahacs80@yahoogroups.com>
Sent: Sunday, April 30, 2006 10:59 PM
Subject: Re: [yamahacs80] "bump" from the envelopes- higest cutoff
> Hey Max
> the +3db change from 64 to 127 makes perfect sense to me....
> when voltage doubles(in audio this correlates to wattage)the change is
> 3dbs.....
> let me guess if these pots are linear compared to voltages and 64 is 0db
> then 32 should be -3db, 16 is -6db, 8 is -9db, 4 is -12db , 2 is -15 and
> 1 is -18...???
>
> 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?
> You have eliminated all other possible culprits Max???? no velocity, no
> AT no eg in the filters??? single note on one mix bank to eliminate
> phasing ???no sub osc or pulsewidth modifiers??? very strange
> indeed........
> Max Fazio wrote:
>
> > 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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