| Hello all
I'm new to this mailing list so he's a brief run down on me, I've be
interested in electronic and more recently in computer generated music for
a while now, I'm currently attending the South Australian School of
Engineering. I'm using a PowerPC Mac 7200/90. Im new to CSound but have had
experience with programming and also with digidesigns TurboSynth. I've been
toying around with the idea of creating a set of routines and classes for
c++ for the creation of music from midi files, but have just discovered
Csound, though I might write a sample editing program that has some
features designed for use with CSound.
I have a couple of questions though they might seem stupid, firstly how do
you use the opcode linenr, it says in the manual that linenr will extend
the performance time of the current instrument but I can't get it to do so.
Secondly what is the difference between the way comb and alpass work, my
understanding of a comb filter is just a short delay where frequencies
cancel and reinforce each other, how do you get an all pass filter.
Nathan Day
nathand@mail.senet.com.au
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From: Hans Mikelson
Subject: Resonant Low-Pass Filter Instrument
Date: Sat, 08 Feb 97 12:51:34 PST
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Here is a resonant low-pass filter I have been working on. I'm
sort of new to filter design type stuff. The coefficients could
probably use some tweaking, and their interelationship may not be
optimized...but it sounds cool! Please email me if you have any
questions or suggestions.
;****************************************************************
; Resonant Low-Pass Filter
; Coded: Hans Mikelson 2/7/97
;****************************************************************
sr = 44100
kr = 44100
ksmps =1
nchnls = 1
instr 1 ; Rezzy Synth based on Diff Eqs
idur = p3
kamp linseg 0, .01*p3, p4, .98*p3, p4, .01*p3, 0
ifqc = cpspch(p5)
ires = p7/1000
kfco linseg .1*p6, p3, p6
kres = ires
; The difference equation coefficients
kb = 1/kfco/kres
kk = 10000/kfco
aynm1 init 0
aynm2 init 0
axn oscil kamp, ifqc, 3
; The difference equation: Yn=((b+2k)Yn-1 - kYn-2 + Xn)/(1+b+k)
ayn=((kb+2*kk)*aynm1-kk*aynm2+axn)/(1+kb+kk)
aynm2 = aynm1
aynm1 = ayn
out ayn
endin
; *********************************************************
; Rezzy Sawtooth Synth
; coded: Hans Mikelson 2/7/97
;**********************************************************
; Sawtooth
f3 0 256 7 1 256 -1
; score ***************************************************
t 0 300
; idur iamp ipch Filter cut-off Resonance
i1 0 2 6000 7.00 1000 5
i1 + 1 6000 7.03 1000 10
i1 . . 6000 7.05 800 15
i1 . . 6000 7.02 1000 20
i1 . . 6000 8.00 1200 25
i1 . . 6000 7.03 1000 30
i1 . . 6000 7.05 500 60
i1 . 2 6000 7.00 1000 5
i1 . 1 6000 7.03 1000 10
i1 . . 6000 7.05 800 15
i1 . . 6000 7.02 1000 20
i1 . . 6000 8.00 1200 25
i1 . . 6000 7.03 1000 30
i1 . . 6000 7.05 500 60
i1 0 8 6000 5.00 200 30
i1 + . 6000 4.10 200 30
i1 . . 6000 5.00 1000 100
e
| | | \ | / Hans P. Mikelson
| __ | __/ | \ | hljmm@discover-net.net
|__ |__ |__ |__ \_ |__ http://discover-net.net/~hljmm/
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From: Toby
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Fixed a bug, added a feature.
NeXT binary (1.0) compliments of Charlie Baker.
Toby
-There otta be a law-
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From: "Peter S. Lakanen"
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Subject: .orc/.sco for tb-303 simulation?
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I've trying to hack together a TB-303 (I think
Roland made it originally). Any advice?
Anyone done it before?
-peter
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From: Hans Mikelson
Subject: Re: .orc/.sco for tb-303 simulation?
Date: Sat, 08 Feb 97 18:29:45 PST
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>I've trying to hack together a TB-303 (I think
>Roland made it originally). Any advice?
There is a schematic at the Music Machines web site:
http://www.hyperreal.com/music/machines/schematics.html
If that's any help. Also see my resonant filter I just posted.
Let me know if you have any luck. This page has links to TB-303
software.
http://www.teknet.ch/tb-303/software/software.htm
Good luck,
| | | \ | / Hans P. Mikelson
| __ | __/ | \ | hljmm@discover-net.net
|__ |__ |__ |__ \_ |__ http://discover-net.net/~hljmm/
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From: Robin Whittle
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Subject: Re: .orc/.sco for tb-303 simulation?
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Peter S. Lakanen asked about using Csound to emulate a TB-303.
I have corresponded with a few people about this - to say that it
would be a very difficult project. The starting point is to get a
TB-303 and study the schematic. Then use an oscilloscope and your
ears to find out what is happening - particularly in the accent sweep
circuit and the two envelope generators.
I do not know how to model the behaviour of the diode ladder filter,
and don't know of anyone who does - they are not textbook perfect
filters.
While I understand the TB-303 as well as anyone, because of my Devil
Fish modification work, (see my WWW site for full info) and while I
am up-to-speed with Csound, including writing my own ugens, I would
attempt a TB-303 emulation with trepidation.
If you can't work with a machine, schematics and oscilloscope, then
you won't be able to do a really accurate emulation.
Much better then to work with Csound to produce your attempt at an
emulation of whatever you think the TB-303 is. This will lead to
much more interesting and novel results than a slavish engineering
based approach.
- Robin
. Robin Whittle .
. http://www.ozemail.com.au/~firstpr firstpr@ozemail.com.au .
. 11 Miller St. Heidelberg Heights 3081 Melbourne Australia .
. Ph +61-3-9459-2889 Fax +61-3-9458-1736 .
. Consumer advocacy in telecommunications, especially privacy .
. .
. First Principles - Research and expression - music, .
. music industry, telecommunications .
. human factors in technology adoption.
. .
. Real World Interfaces - Hardware and software, especially .
. for music .
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Subject: Re: .orc/.sco for tb-303 simulation?
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Peter S. Lakanen asked about using Csound to emulate a TB-303.
I have corresponded with a few people about this - to say that it
would be a very difficult project. The starting point is to get a
TB-303 and study the schematic. Then use an oscilloscope and your
ears to find out what is happening - particularly in the accent sweep
circuit and the two envelope generators.
I do not know how to model the behaviour of the diode ladder filter,
and don't know of anyone who does - they are not textbook perfect
filters.
While I understand the TB-303 as well as anyone, because of my Devil
Fish modification work, (see my WWW site for full info) and while I
am up-to-speed with Csound, including writing my own ugens, I would
attempt a TB-303 emulation with trepidation.
If you can't work with a machine, schematics and oscilloscope, then
you won't be able to do a really accurate emulation.
Much better then to work with Csound to produce your attempt at an
emulation of whatever you think the TB-303 is. This will lead to
much more interesting and novel results than a slavish engineering
based approach.
- Robin
. Robin Whittle .
. http://www.ozemail.com.au/~firstpr firstpr@ozemail.com.au .
. 11 Miller St. Heidelberg Heights 3081 Melbourne Australia .
. Ph +61-3-9459-2889 Fax +61-3-9458-1736 .
. Consumer advocacy in telecommunications, especially privacy .
. .
. First Principles - Research and expression - music, .
. music industry, telecommunications .
. human factors in technology adoption.
. .
. Real World Interfaces - Hardware and software, especially .
. for music .
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From: Marc Resibois
To: "Peter S. Lakanen" , csound
Subject: Re: .orc/.sco for tb-303 simulation?
Date: Sun, 9 Feb 1997 00:32:56 -0000
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There are some programs out there that should emulate some kind of a 303.
The latest hype seem to be the Rebirth RB-338. Take a look to
http://www.teknet.ch/tb303.htm for a whole plunge on 303 resources....
Cheers,
Marc.
|