TTAudioSignal now overrides the += operator.  This means we can write code like this: 	anAudioSignal += anotherAudioSignal; and the sample values from all channels of the second signal will be summed into the first audio signal.
TTAudioSignal now overrides the += operator.  This means we can write code like this:
	anAudioSignal += anotherAudioSignal;
and the sample values from all channels of the second signal will be summed into the first audio signal.

This is required for supporting multiple outputs connected to the same input in a Lydbær graph.


git-svn-id: 70e004b0fe139654417ecae95160fb6d1b675565@807 bc2ad3ca-9a4d-0410-8d14-35da9c29b421

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