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Re: follow works only once

Date1999-04-14 13:51
Fromjpff@maths.bath.ac.uk
SubjectRe: follow works only once
Message written at 12 Apr 1999 17:49:29 +0530
--- Copy of mail to mjkoskin@sci.fi ---

Follow is working OK for me.  Perhaps I changed something since your
version?  I do not think I have.
==John ffitch


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From: Jim Stevenson 
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To: csound@maths.ex.ac.uk, rwd@cableinet.co.uk
Subject: Re:  best soundcards?
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I am looking for the best soundcard to buy to run csound under Dos or linux.

I can not afford the $1,000 A/D dedicated extended csound card.

I also would really like at least 4 chanels.

I have coded a tun of driver c code for the opl fm chip rejesters, so 
I still need opl3 or better.

Thanks.


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Date: Wed, 14 Apr 1999 16:09:13 +0200 (MET DST)
From: Thomas Huber 
Subject: Distorsion
To: csound@maths.ex.ac.uk
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I have problems using the 'distort1' opcode. While the parameters
for pregain and postgain work ok the next 2 parameters have no
influence on the resulting distorsion. The distorted signal sounds
very bad, as if it was clipped with a hard limit, and not as expected
with a round slope. My input signal hast an amplitude of ~15000, the
pregain can be tuned from 0.001 to 10, the postgain is 1/pregain
if the resulting value is >1 and 1 if it would be <1
(1/pregain < 1 ? 1 : 1/pregain).
Did I miss something ?

Has someone programmed a good sounding distorter (one that I like very
much is the one in Rebith-338) ?



Thanks,


Thomas



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From: David Boothe 
To: 'Csound' 
Subject: Manual Supplement
Date: Wed, 14 Apr 1999 13:58:47 -0500
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I have placed a revised pdf Supplement to the Manual on the server. It has
improved diagrams for Richard Boulanger's Tootorial. Also, there is now a
set of orchestra and score files (in zipped form) to accompany the
Tootorial.

As always, the URL is http://web2.airmail.net/dboothe

Enjoy.

-David.



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From: Hans Mikelson 
To: csound@maths.ex.ac.uk
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Subject: Re: Distorsion
Date: Wed, 14 Apr 1999 20:29:15 -0500
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Hi,

The distort1 opcode is not band limited.  Post filtering the signal may help
a little.  For band-limited distortion look into using Chebyshev polynomials
(GEN13 & GEN14).  Also refer to my article in Csound magazine last month for
another distortion example.  The two shape parameters in distort effect the
shape of the upper and lower wave form.  This is illustrated best using a
sine wave.  Following is an example:

; ORCHESTRA
sr=44100
kr=4410
ksmps=10
nchnls=2

       instr    1

idur   =        p3
iamp   =        p4
ifqc   =        cpspch(p5)
ipre   =        p6
ipost  =        p7
ish1   =        p8
ish2   =        p9

aamp   linseg   0, .01, 1, idur-.02, 1, .01, 0
asig   oscil    iamp, ifqc, 1
adst   distort1 asig, ipre, ipost, ish1, ish2
       outs     adst*aamp, adst*aamp

       endin

; SCORE
f1 0 8192 10 1

;   Sta  Dur  Amp   Pitch  Pre  Post  UpperShape  LowerShape
i1  0    .5   10000 7.00   10   1     0           0
i1  +    .    .     .      .    .     .1          .
i1  .    .    .     .      .    .     .2          .
i1  .    .    .     .      .    .     .1         -.1
i1  .    .    .     .      .    .     .2         -.2




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Date: Wed, 14 Apr 1999 21:46:47 -0700
From: Sean Costello 
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To: Thomas Huber 
CC: csound@maths.ex.ac.uk
Subject: Re: Ringing bandpass ?
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Thomas Huber wrote:


> A state-variable-filter - oh yes yes, please, could you code one ?
> I'd love to have another excellent sounding filter like 'moogvcf'.
> And as far as I know, the state variable filter can be used as
> lowpass, bandpass, highpass and notch (band-reject) at the same time,
> depending on where you take the output (in the analog circuit, I have
> no indea how it is in the digital implementation). So we would have
> another cool filterset, let's say 'statelp', 'statebp', 'statehp',
> 'statebr'. 

What I was thinking of was an output structure like the LPC opcodes,
where you have multiple outputs that are available, i.e.:

alow, aband, ahigh   statevar   ain, kfreq, kq, [imode]

The notch mode would come from mixing the highpass and lowpass outputs,
instead of having a preset notch output. A nice feature of this is that
by varying the ratio of highpass to lowpass, you can sweep the notch
frequency up and down, like a 2-pole phase shifter (this feature was
found on the Oberheim SEM module).

Since I think a state-variable filter is not as prone to overflow as a
reson filter, I think that imode could be an optional argument, used to
select a nonlinearity in the feedback loop. This is apparently useful
for generating chaotic waveforms, and might be a nice "chaos processor"
for live and/or sampled signals.

I am going to dig through my old Electronotes issues - I know that there
was a 4-pole state-variable circuit in there, that might be translatable
into digital. This would be very cool, as the output curves of the
circuit were very interesting.
  
> > Does the moogvcf opcode self-oscillate? I am under the impression that
> > no digital filter self-oscillates without an initial source of
> > excitation, but I could be wrong.
> 
> It does self-oscillate, yes. I think that the moogvcf is not a classical
> digital filter, it's a simulation of an analog circuit filter

I wonder, though, if it truly self-oscillates - in other words, can you
use it with no input, as a sine wave source, like a real Moog filter? I
guess I could try it out.

Sean Costello


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Date: 14 Apr 99 22:52:45 MDT
From: craig routt 
To: csound@maths.ex.ac.uk
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hi every one. how is your day?

it is raining like a big monster here in omaha nebr.



I saw an editor for csound called csedit which ran

on windows/ibm. can anyone tell me where i saw that

unit .  I seem to have misplaced it and can't find

my trail back to it again.




also why won't WORD6 edit michalsons .orc on the =


windows platform?  I also tried the resident

editor in most ibm , but it did not work either.

the only one I found to work was csedit!

thank you

craig-routt@usa.net

____________________________________________________________________
Get free e-mail and a permanent address at http://www.netaddress.com/?N=3D=
1


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From: Roger Klaveness 
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Hi Craig, csedit should be here :
http://members.tripod.com/~fz3/csound/csedit.zip

Roger

craig routt wrote:
> 
> hi every one. how is your day?
> it is raining like a big monster here in omaha nebr.
> I saw an editor for csound called csedit which ran
> on windows/ibm. can anyone tell me where i saw that


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My thougths on self oscilations:
In analog circuits there is always some noise present (thermic noise at least) 
whichs excites the filter .In the digital world if you have zero you have 
zero,and how much you try to amplify and filter zero you still get zero, so 
you must have something to excite the filter, you could try with some low 
level noise to simulate the thermic noise maybe

Roger

> > > Does the moogvcf opcode self-oscillate? I am under the impression that
> > > no digital filter self-oscillates without an initial source of
> > > excitation, but I could be wrong.
> >
> > It does self-oscillate, yes. I think that the moogvcf is not a classical
> > digital filter, it's a simulation of an analog circuit filter
> 
> I wonder, though, if it truly self-oscillates - in other words, can you
> use it with no input, as a sine wave source, like a real Moog filter? I
> guess I could try it out.
> 
> Sean Costello


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From: Sergey Batov 
To: craig routt , csound@maths.ex.ac.uk
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Hi,
I'm not sure but may be there is a link to it on
http://mitpress.mit.edu/e-books/csound/frontpage.html

Word 6 e.t.c. uses special invisible (!) symbols and this is a source of
problems.
But having a little of dexterity it is possible to use Win95's Wordpad or
Notepad. Highly recommended Programmer's File Editor
(http://www.lancs.ac.uk/people/cpaap/pfe/).

Regards,
Sergey Batov   batov@glasnet.ru
----------
> =CE=F2: craig routt 
> =CA=EE=EC=F3: csound@maths.ex.ac.uk
> =D2=E5=EC=E0:=20
> =C4=E0=F2=E0: 15 =E0=EF=F0=E5=EB=FF 1999 =E3. 8:52
>=20
> hi every one. how is your day?
>=20
> it is raining like a big monster here in omaha nebr.
>=20
>=20
>=20
> I saw an editor for csound called csedit which ran
>=20
> on windows/ibm. can anyone tell me where i saw that
>=20
> unit .  I seem to have misplaced it and can't find
>=20
> my trail back to it again.
>=20
>=20
>=20
>=20
> also why won't WORD6 edit michalsons .orc on the=20
>=20
> windows platform?  I also tried the resident
>=20
> editor in most ibm , but it did not work either.
>=20
> the only one I found to work was csedit!
>=20
> thank you
>=20
> craig-routt@usa.net
>=20
> ____________________________________________________________________
> Get free e-mail and a permanent address at http://www.netaddress.com/?N=
=3D1
>=20


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From: Bob Douglas 
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Subject: Re: Ringing bandpass ?
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Roger Klaveness wrote:
 
> My thougths on self oscilations:
> In analog circuits there is always some noise present (thermic noise at least)
> whichs excites the filter .In the digital world if you have zero you have
> zero,and how much you try to amplify and filter zero you still get zero, so
> you must have something to excite the filter, you could try with some low
> level noise to simulate the thermic noise maybe

Benoit Mandelbrot's discovery of fractals was as a result of work he was doing
on the French telephone system. He was examining the characteristics of noise
in an attempt to eradicate, or at least minimise (obviously analogue) unwanted
signalson the phone lines. It might be an idea to try some fractal noise to
excite the filter. Perhaps the quality of the noise is as important to the
generation of a rich source of self-oscilation as the degree to which it is
low level.
I haven't seen Mandelbrot's results, but I imagine that within this low
amplitude range, there would be self-referential relationships between the
levels (and frequencies) of separate noise components, which lead to fractal
behaviour. The trick is to generate fractal noise....

Bob Douglas


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Date: Thu, 15 Apr 1999 03:23:28 -0600
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Subject: Re: Ringing bandpass ?
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>The trick is to generate fractal noise....

















































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proof dzat truth !=3D def!nabl




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