Now that things don't matter and the time has passed, the ICC have decided to formally investigate volume knob gate.
Bit late now, but perhaps Daryl Harper can be shamed in to becoming a better umpire (chances are very slim).
The referral system is supposed to prevent bad decisions. Actually all it does is make everyone question the umpires. When a bad judgement was made before referrals were brought in, you just dealt with it. These things happen. Quite often. They're only human.
But now they have super powers of replay, hot spot, snicko and hawkeye.
Some clever man once said: "With great power, comes great responsibility."
This has become more relevant than just to spiderman. Series ride on this.
NWG can't help but feel, either do it properly with all the modern technology (including volume control) or don't do it at all.
It's really that simple.
Perhaps there needs to be a fifth umpire to oversee the fourth and the third, just to be on the safe side.