On Sunday 20 November 2005 20:35, Iain Duncan wrote:

> However, total system latency from
> audioin-through csound->audio out is 1.5 ms, measured with a loopback
> through a hard disk recorder and looking at the resultant wave files. So
> my system is obviously the main latency issue. I have been told this
> should be improvable by going from my 2.6.12 to 2.6.14rt, I will do the
> test again then. Because of the system latency, the effective difference
> between -b2 -B4 and -b4 -B16 seems to be none.
>

1.5ms is about 64 sampleframes. Your buffer is 4 frames so that leaves about 
28 samples latency for the hardware each way. There is nothing in software 
that can change that, that is just build in the electronic circuit. In the 
some way every digital mixer has channel-latency on its analog inputs. 
So B16 or B32 are good defaults for live effects I think. And that is still a 
lot better than windows or OSX can do.
It is amazing that a general purpose OS can get that close to a hard realtime 
embedded system.

G

PS
 1.5 ms latency is what you get when you move the loudspeaker about 15 inches 
further away.


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