Paul,
I run Voicemeeter mixer software with my HL2, it includes VAC options and is quite easy to set up. The advantage of using Voicemeeter is that you can see VU meter indications of your audio and route the audio to any device for listening. An added bonus is that you can also have other sets, sdr etc connected, I have my TS-590, IC-9700 and SDRplay RSPDX also connected. Voicemeeter also has EQ, volume limiter and compression capabilities. Voicemeeter is free to trial and suggested donationware for purchase, the donation amount is very small.