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should au latency propagate through the graph?
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should au latency propagate through the graph?


  • Subject: should au latency propagate through the graph?
  • From: Brian Whitman <email@hidden>
  • Date: Thu, 13 Apr 2006 14:20:56 -0400

We've got:

scheduled sound player -> mixer input 0
mixer output 0 -> aufc/tmpt
mixer output 1 -> end mixer input 0
aufc/tmpt -> end mixer input 1
end mixer -> output

i.e. a generator split into a "effect chain--" one path going right to a mixer then output, one path going through an effect then to the mixer then output. The user/code can turn up and down the "effect send" by changing the end mixer's input gains.

a) Is this the way to implement such an effect bus, or are there more specialized methods?

b) If we use aufc/tmpt as the effect, there's obviously a latency involved. If I play this graph with both effect and "dry" mixers turned up, I can hear that the clean version is some latency ahead of the effected version. Shouldn't the latency of the effect AU somehow inform the other AUs to wait before rendering? Or do I manually have to add a sample delay to the dry version before feeding it to the mixer?

If so, looking at the list archives I see there was a known issue with aufc/tmpt latency reporting. Has this been fixed?

c) Is there a better way to "bypass" an effect? Setting the aufc/tmpt rate at 1.0 still incurs the same CPU wrath as if it were "working."


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