If it's the sample format, it could be the low-level driver (manufacturer's driver, sound card). Try a different format. Are you trying float? Then try 16 bit int. Some cards only do certain sample rates also.

Regards,
Mike

-----Original Message-----
>From: Victor Lazzarini 
>Sent: Jan 13, 2006 11:02 AM
>To: csound-devel@lists.sourceforge.net
>Subject: Re: [Cs-dev] Linux performance
>
>I tried -o dac:hw:0 and I could not run it, as csound
>says "unable to set sample format requested",
>whereas with -o dac:plughw:0 it runs as before.
>
>The same orc runs on my Windows machine OK (with
>-b1024).
>
>What kernel are you running? Do you have a low-latency patch?
>
>Victor
>
>At 15:50 13/01/2006, you wrote:
>>On Friday 13 January 2006 16:40, Victor Lazzarini wrote:
>>
>> > I used the default outdevice (-odac) and anything from
>> > -b64 -B512 up to -b2048 -B4096
>>
>>Try using -o dac:hw:0 with -+rtaudio=alsa (-o dac:hw:1 for
>>the second card, etc.). Also, PVOC with a large FFT size may
>>not be friendly to low latency real time audio, due to the
>>uneven CPU usage.
>>
>>
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>Victor Lazzarini
>Music Technology Laboratory
>Music Department
>National University of Ireland, Maynooth 
>
>
>
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