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Re: How do you play four channels?

Date1998-01-23 23:45
FromRichard Dobson
SubjectRe: How do you play four channels?
I have found no problem with simultaneous (asynchronous) playback of 44K
stereo from two soundcards, on my P133 system (Soundblaster clone and
DAL CardD, both ISA); my guess is that the hard disk system is the more
critical factor. If I start one card playing, then ask the second to
prepare a sound, a short glitch is induced in the first sound as the
disk is accessed. Thereafter playback on both is clean. If the files for
both cards are opened together (as they would be for pseudo-4ch
playback), even this problem disappears. I am using a Micropolis AV SCSI
drive.

The key to generic 4channel playback must be card driver, which must
offer the necessary channels. Even when I ask MediaPlayer to play a 4ch
soundfile, it does not reject it out of hand, but merely informs me the
driver cannot accept that format. If wave devices are listed as
supporting only stereo (even if there are several of them), the Windows
Wave Mapper will not find a single device which supports the format.

Microsoft would simply describe a 4channel file as a 'non-standard
format', but perfectly reasonable in principle. Indeed, the 48KHz sample
rate is a 'non-standard' format as far as they are concerned!

One possibility for the PC in the future (apart from the Csound card) is
the Codec97 specification, which is designed to support multi-channel
digital audio via USB and firewire:

http://developer.intel.com/pc-supp/platform/ac97/index.htm

Some companies have reached the stage of producing chip sets for this
(Harris, and possibly also Analog, though I haven't checked).

Behind all this lies the need to determine some new standard and
portable  multi-channel format, which card manufactuers can reasonably
be invited to support - six channels as a minimum (for AC3), but
probably eight as a 'round number' and compatible with ADAT, for
example. I would be surprised, in fact, if something along these lines
is not already being hatched behind the scenes - does anybody 'know'
anything in this respect?  It will probably be a toss-up between some
emergent de-facto standard, or some ex cathedra directive from
Microsoft. Perhaps even Apple are working on something?

Perhaps this is an issue in which the Csound community at large can take
the initiative and press manufacturers (and even Microsoft/Apple etc) to
go the extra mile and produce drivers for their multi-channel cards,
which will accept a single file up to the maximum channel width their
hardware will support, rather than, as seems to be the case at present,
present the hardware in terms of so many stereo devices.

Richard Dobson


Eli Brandt wrote:

> Christopher Neese wrote:
> >
> > In theory, opening two soundcards and operating them in parallel is
> > possible.  However there are two catches to using multiple
> soundcards.
>
> A third catch for good measure: their clock crystals will drift.
> General solutions to this are expensive, and limited solutions are
> annoying.
>
> --
>      Eli Brandt  |  eli+@cs.cmu.edu  |  http://www.cs.cmu.edu/~eli/



Date1998-01-24 17:03
FromHans Mikelson
SubjectRe: How do you play four channels?
Hello,

If you have a four track recorder (porta-studio) you could create some four
channel sounds if the timing were not too critical.  The best solution for
amplifying, that I've been able to think of, is to just use two stereo
amplifiers and four speakers.  So far I have the four track and recievers
but I need to repair my second set of speakers.

Bye,
Hans Mikelson




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From: Dave Perry 
To: CSound list 
Subject: Visual Orchestra 1.6
Date: Mon, 26 Jan 1998 02:37:21 -0000
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An 1.6 upgrade file for VisOrc is now available from
http://128.243.34.18/

(Please use the Nottingham mirror until Monday 26th Jan)

New Features in version 1.6


The Score
---------
=The Score Editor has been completely reworked,   its now fast and stable.
=The Score Editor now contains a text based list editor
=Filters,  functions,  formulas,  randomisation, ramps,  value
stretching/compression, data from files and other score manipulation
commands have been added.
=Number of P-Fields limited only by memory.
=Negative values now accessable in score.
=Multiple Instrument Scores now fully working
=Customisable score f-statements

The Orchestra
-------------

=Closer and more seamless integration with Score
=Csound Variable Structure implemented including Globals
=Many more opcodes added including Table Access
=Device menu reorganised in style of CSound Help File
=Seperate Orchestra and Score Menus
=Project SAVE and LOAD now working properly
=Audio/control/init/global options for all units
=Stereo Output now working (also outs1 and outs2 options)
=Compile All/Compile Active options added
=Function bug fixed
=Unit names implemented
=SR/KR user definable
=Customisable Command line options
=INIT options added
=Interface simplified and made more versatile,   nested functions and pfield
calls now available anywhere in Orchestra
=Tutorial Instruments supplied
=New user manual in .DOC and .TXT format

I hope you enjoy VisOrc!

David Perry
dave@dingy.demon.co.uk




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From: "Jim Stevenson Ph.D" 
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To: csound@maths.ex.ac.uk, davids@pavell.com
Subject: Re:  Sound Editors & Spirituality ?
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Please define exactly what you mean by "spirituality".
If you mean the idea of a non physical consciousness or anything else 
supernatural, I suggest it be discussed on a null band width list.

If you mean the connection between audio and the emotional centers of the brain, I am very interested.

Cheers.



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From: Khalid 
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I would like to know your opinion on this:

Is it legal to release music created with csound on
the standard music market? As i understand the copy-
right that relates to csound, it is not.

kd



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From: Gene Dinkey 
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I'm a DJ from Ft. Collins, CO. who is interested in trying my hand at 
composing.  I was given a recomendation for Csound software and was told 
it was very powerfull.  

I visited the ftp site at bath (i forget the exact address offhand), and 
downloaded what I thought was the exe file I would need from 
/platforms/win95/bin (I believe).  

I got the file and uncompressed it, when I tried to run it it wouldn't 
work.  It occured to me that I might need a C compiler to set it up and 
run it.  If I'm correct could someone please refer me to a ftp that 
possibly has a shareware/freeware version of one?  If I happen to be 
mistaken then could I get the path for the program that will run in 
Win95, or if I have to then I'll runit in DOS.


Thanx...G-der

Gene Dinkey

______________________________________________________
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To: CSOUND-LIST 
Subject: Csound 0.31 or 3.47 ?
From: Araoz 
Date: Sat, 24 Jan 1998 21:47:33 +0100
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Which is the difference between Csound 0.31b and Csound 3.47 for Mac?
Many people talk about the 3.47 version but I only found, in the ftp
sites that I know, the first version.

Another question: Does exist a graphic editor for Csound?
Thanks 


-- 
Laura et Ricardo NILLNI
nillni@mail3.imaginet.fr  
rnillni@usa.net
http://www.imaginet.fr/~nillni



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Subject: Re: How do you play four channels?
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Eli Brandt wrote:
> 
> A third catch for good measure: their clock crystals will drift.
> General solutions to this are expensive, and limited solutions are annoying.

Reviewing some basic facts may save some frustration.

Every DAC has a finite amount of delay while it does the conversion.
This delay time seems to vary with the chip used, design implementaion,
etc. Therefore, using simultaneous digital and analog outputs would
cause the two stereo pairs to be out of sync with each other. 

Analog outputs from two sound cards of different makes/models would
probably have the same problem due to different processing delays in the
DACs. Two identical stereo soundcards would need to be run from a common
clock, as Eli Brandt points out, or phase shift results.

The delays can be less than 1 millisecond up to several ms. With shorter
delays, the problem is with material common to both stereo pairs, i.e.
one sound centered or panned from one channel to the other.

It seems a single integrated solution is in order.

David Boothe




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Date: Sun, 25 Jan 1998 13:43:56 -0500
From: George Campbell 
Subject: Re: Copyright considerations
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> From khalid.dermoumi@uni-essen.de Sun Jan 25 13:31:06 1998
> Date: Sun, 25 Jan 1998 18:37:28 +0100
> From: Khalid 
> Subject: Copyright considerations
> To: csound@noether.ex.ac.uk
> 
> I would like to know your opinion on this:
> 
> Is it legal to release music created with csound on
> the standard music market? As i understand the copy-
> right that relates to csound, it is not.
> 
> kd
> 

  According to my understanding of the copyright as it applies
  to CSound, the program is like a compiler. The program itself
  may only be distributed according to the terms listed in the
  copyright, but music created with the program belongs to the
  person who created it, and may be released just like music
  created using more traditional musical tools.
  Just my $0.02. For a more thorough discussion of Copyright
  issues, you should consult the Copyright FAQ.
  
  George
  



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From: Jean Piche 
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Per Villez wrote:
> 
> Aha!. Thanks John. Funny though, that this 'pow' opcode should be after the
> Reverb opcodes in the manual and no where near the value converters
> (log,exp etc). It wasn't in the place I expected it to be, but many thanks
> for the info
>

Per,

It's right there between 'ampdb' and 'irnd' in the Value Converters section...
in the html version of course, which is , I believe, the only complete version
for 3.47 presently...



-- 
________________________________________________________
Jean Piche
Universite de Montreal
http://mistral.ere.umontreal.ca/~pichej
http://www.musique.umontreal.ca/electro/CEC/



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Date: Mon, 26 Jan 1998 11:19:44 +0000
To: Jean Piche 
From: Per Villez 
Subject: Re: Raising to the power?
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Jean Piche wrote:

It's right there between 'ampdb' and 'irnd' in the Value Converters section...


In the manual which comes with the Mills version of PPC Csound which is
what I have this is not the case. The 'pow' opcodes are under 'Signal
modifiers'  straight after 'reverb' and definitly not under 'Value
converters'. I have tried to establish the version of this manual and reads
"Csound Manual DocMaker Standalone version 4.7.5 Created May 5th 1997".
This comes with the utility Csref which references the  manual.
Having said this I will obtain the most current version of the PDF manual.
Per








>Per Villez wrote:
>>
>> Aha!. Thanks John. Funny though, that this 'pow' opcode should be after the
>> Reverb opcodes in the manual and no where near the value converters
>> (log,exp etc). It wasn't in the place I expected it to be, but many thanks
>> for the info
>>
>
>Per,
>
>It's right there between 'ampdb' and 'irnd' in the Value Converters section...
>in the html version of course, which is , I believe, the only complete version
>for 3.47 presently...
>
>
>
>--
>________________________________________________________
>Jean Piche
>Universite de Montreal
>http://mistral.ere.umontreal.ca/~pichej
>http://www.musique.umontreal.ca/electro/CEC/