Apple

My plugin needs the take in 4 channels (no side-chains) and output 1 channel based on the 4 inputs. Another needs to take in 4 input channels and use all 4 inputs to create the 4 output channels.

1. In the past I used the AUEffectBase class following the AUEffectBase.h comment and did the ProcessBufferLists override (this doesnt seem to work anymore in 10.7 (auval craps out) or I am just not doing something correctly but I have not really looked into it yet.)

// If your unit processes N to N channels, and there are no interactions between channels,

// it can override NewKernel to create a mono processing object per channel. Otherwise,

// don't override NewKernel, and instead, override ProcessBufferLists.

However in the implementation file I read:

This class does not deal as well as it should with N-M effects...

The problem areas are (if the channels don't match):

ProcessInPlace if the channels don't match - there will be problems if InputChan != OutputChan

Bypass - its just passing the buffers through when not processing them

This will be fixed in a future update...

2. In the Appendix: Audio Unit Class Hierarchy API docs it says to start with the AUBase class for n - to - m:

For general, n-to-m channel effect units, start with the AUBase class
For n-to-n channel effect units, which map each input channel to a corresponding output channel, start with the AUEffectBase class

3. The AUPinkNoise generator, which does 0 - to - n, uses the AUBase class and overrides the Render method. If I went this route so for a 4 - to - 1 would I still over ride the Render method?

And what about this new AUPannerBase class... I can't seem find any documentation about it.

Thanks,

michael