Resets variables dependent on frame history.
This method has no parameters.
This method does not return a value.
Constant and locked parameters such as the input and output formats remain unchanged. Variables set by IXAPOParameters::SetParameters remain unchanged.
For example, an effect with delay should zero out its delay line during this method, but should not reallocate anything as the XAPO remains locked with a constant input and output configuration.
XAudio2 only calls this method if the XAPO is locked.
This method is called from the realtime thread and should not block.