change default audio buffer size?

Development Audio
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1

Is it possible to change the audio system’s default audio buffer size? And while I’m at it, is it possible to change the default sample rate?

2

Specifically I’m looking to change the buffer sizes in custom USoundWave classes. It looks like the buffer size is set in AudioCompress.h:

#define MONO_PCM_BUFFER_SAMPLES		8192

Is there any way to change this without building UE4 from source?