When set to 1, USoundWaves we will always attempt to synchronously load a chunk after a USoundWave request has finished0: Don't try to block after a SoundWave has completed loading a chunk, 1: Block after a USoundWave's chunk request has completed.
Usage
au.streamcache.BlockOnChunkLoadCompletion [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.