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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