Also, if you're on the XO and having trouble with the default pulseaudio 
output, try -+rtaudio=alsa. It works much better.

Art Hunkins

----- Original Message ----- 
From: "Steven Yi" 
To: 
Sent: Wednesday, April 14, 2010 6:21 PM
Subject: [Csnd] Re: MIDI playback


Hi Andrew,

This error message seems to be the main clue:

outs inconsistent with global nchnls (1); replaced with out

I have not seen the CSD but my guess is that it has a line setting
nchnls to 1 like this:

nchnls=1

probably in the head of the  section.  I'd try changing that 
to:

nchnls=2

steven


On Wed, Apr 14, 2010 at 5:58 PM, See Sound  wrote:
> Hi, all
>
>
>
> I am following the example on 
> http://wiki.laptop.org/go/Csound#MIDI_playback
>
> Copying and pasting the "GM_example.csd" code (also modifying the path to
> the sound font), but "csound ./GM_example.csd" gives me:
>
>
> time resolution is 1000.000 ns
> virtual_keyboard real time MIDI plugin for Csound
> 0dBFS level = 32768.0
> Csound version 5.10 beta (double samples) Dec 3 2009
> libsndfile-1.0.20
> UnifiedCSD: ./GM_example.csd
> STARTING FILE
> Creating orchestra
> Creating score
> orchname: /tmp/filepv0vlb.orc
> scorename: /tmp/fileMOARQL.sco
> rtaudio: pulseaudio module enabled
> orch compiler:
> 122 lines read
> instr 1
> instr 10
> outs inconsistent with global nchnls (1); replaced with out
> error: too many input args, line 122:
> outs a1*kvol*(0.5-kpan/2)*kenv, a2*kvol*(0.5+kpan/2)*kenv
> error: input arg 'a2*kvol*(0.5+kpan/2)*kenv' of type a not allowed when
> expecting i, line 122:
> outs a1*kvol*(0.5-kpan/2)*kenv, a2*kvol*(0.5+kpan/2)*kenv
> ################################################################
> # WARNING: OPCODEDIR64 IS NOT SET ! #
> # Csound requires this environment variable to be set to find #
> # its plugin libraries. If it is not set, you may experience #
> # missing opcodes, audio/MIDI drivers, or utilities. #
> ################################################################
> 2 syntax errors in orchestra. compilation invalid
> Removing temporary file /tmp/fileMOARQL.sco ...
> Removing temporary file /tmp/filepv0vlb.orc ...
>
> ------------
>
> What am I doing wrong?
>
> I could not get any help on the OLPC mailing list, nor on IRC.
>
> TIA
>
> andrew


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= 



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I /had/ to specify "alsa" on my "standard" Fedora 12 notebook, since I had removed pulseaudio from it (doesn't work in that system); however, I may not have done the same for the XO; can't remember at this point (don't have the setup at the moment, to verify)

However! You tips have led to my successful midi-csound-tone generation on the XO, as well as on standard Fedora 12. Curiously, the lag on the standard system was an awful one to two seconds, but on the XO there was barely any noticeable lag. There is slight audio distortion on the XO, but that's probably the limitation of the XO audio hardware (wish it was a tad louder, too)

Again, thanks for not passing by this newbie and coming to my rescue

(I will return to this project in a couple of days; currently in a crunch with deadlines)

thank you all

andrew