Re: I/O Latency (Was: Layman with a mission)
Re: I/O Latency (Was: Layman with a mission)
- Subject: Re: I/O Latency (Was: Layman with a mission)
- From: John Pitcairn <email@hidden>
- Date: Thu, 14 Oct 2004 11:46:15 +1300
Bill, Phillipe, thanks for your responses. Again, note I am bcc-ing RME.
At 12:03 PM -0700 10/13/04, William Stewart <email@hidden> wrote:
Given these numbers (RME differences between OS 9 and OS X), I think the
real issue is the quality and performance of this driver.
I think that is also what Angus/Brian are trying to say - that the
fundamental disparity here is NOT an architectural problem in Mac OS X, but
rather a specific problem with the RME driver. I don't understand personally
why the RME driver cannot get to a similar figure of 192 samples on X -
particularly as other manufacturer's devices/drivers show that this is
indeed entirely possible.
Can you provide an example of a multichannel device that can achieve
that sort of latency under OS X? In Logic perhaps?
I'd suggest following up with RME - a comment/complaint from a user goes a
long way...
RME suggest that there are two factors involved - the safety offset
of the CoreAudio driver (32 each way for the Multiface I think),
which is not used under ASIO in OS 9, and additional buffering by the
application (Logic in this case).
It was suggested that Logic is using approx 64 samples of additional
buffering when running in OS X. Would anyone in the know care to
comment?
At 4:50 AM -0700 10/13/04, Philippe Wicker <email@hidden> wrote:
I'm perfectly aware that going under the 64
samples buffer size is risky and therefore maybe that musicians should
accept that self-monitoring using DAWs has some limitations and cannot
completely replace the direct monitoring.
Which begs the question ... what's happening in regard to support for
a direct monitoring protocol in CoreAudio, to allow the app to
directly control the hardware monitoring? There are a lot of users
who have come from ASIO who are really missing this.
Thanks.
--
John Pitcairn
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