Simultaneous playback of multiple audio streams?

I use OBS Studio to record game footage for editing, and I have the program set up so that it records three different audio streams for better editing flexibility. However, this makes it difficult to review the footage as while watching a video (with MPC), I can only listen to one audio track at a time, so I'll have to switch between tracks rather often. My current workaround is to just play back the video in Sony Vegas (which I use for editing), although this isn't very convenient for brief reviewing as just being able to open the file in a video player instantly, as Vegas takes a little while to load, and then open and properly load video files.

Some time ago, I did try to configure K-Lite and MPC to play multiple audio streams at the same time. The furthest I got was using Haali media splitter instead of the default LAV splitter, to engage multiple audio decoders for each stream, but I never got it to work.  Does the codec pack have this functionality at all? (If not, I guess this is now a suggestion. )

Disable the audio switcher in MPC options.

You also need to use a splitter that exposes multiple audio pins. Most splitters (such as LAV) only expose one pin (with stream switching functionality).