Re: Multi-bus AU's and Logic
Re: Multi-bus AU's and Logic
- Subject: Re: Multi-bus AU's and Logic
- From: graffiti <email@hidden>
- Date: Mon, 29 Nov 2004 22:42:04 +0000
Is it just AU plugin developers who have mistaken this, or some of the
host developers too?
If we change the bus count in our AUs, is it possible that stereo
plugs will appear as Mono in some hosts? Or do all hosts use the
coreaudio api 100% and therefore it shouldn't be an issue?!
Oh, and if we use the latest SDK, will our AUs still function on OX10.2?
Just wanted to check :) Thanks,
Kieran.
William Stewart wrote:
Multi-bus AU's and Logic
In
chatting with the Logic engineers, we came to the realisation that one
of the problems they are having to deal with are the incompatible
versions of the AU Instruments...
The problem this causes is that if Logic wires things up the “correct”
way – which it does in Logic 7, then these older AU’s cause noise to be
generated on their alternate buses. (These are the AU’s that
incorrectly assumed that the number of outputs in the AU implementation
classes meant “number of channels” - when it actually means “number of
buses”) - so these AU’s create 2 ouput buses (instead of 1 output of 2
channels)... Because the AU is doing nothing with this second bus, its
completely random noise that is coming out. The fix is simple – just
change the numOutputs argument in your constructor to 1!
As this problem means that noise is generated on the second bus it is a
very unsatisfying user experience (to put it mildly), and causes
ongoing problems as Logic tries to move over to support the valid
multi-bus AU’s that are available. This is also a problem that auval
cannot pick up on, as the AU essentially looks fine (and auval can’t
determine of course if the produced audio is good or bad).
So, we need all of the AU’s that have been developed this way to be
fixed. We’re compiling a list of the problematic AU’s (with their
version numbers that we’ll be making available) - I’m hoping that most,
if not all, of the developers of these AU’s are on this list and will
fix these AU’s and make a fixed version available ASAP.
Thanks
Bill
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