I’m running the BMDMM. It does pass thru audio to whatever device can disembed the audio signal from the video. I bought at $58 HDMI audio disembedder, which I then feed to my speaker amplifier system. Works the bomb!
Disclaimer: This assumes you’re using the sdi port, so HDMI is free. If not, the audio disembedder will pass thru the HDMI video signal to feed the monitor.