One of Goodison's past criticisms was that it had too many acoustical pens. So songs had a lot more work to do for them to reach all the different parts of the ground. So the traditional home in the middle of the Gwladys Street where all the songs started had to contend with a mix between no roof and an overhang from the upper Gwladys St that wasn't designed for amplifying noise. The songs needed to compensate for the lack of acoustics by a greater percentage of fans joining in for them to spread to the rest of the Lower, the upper, then to the Enclosure, Main Stand, Paddock etc etc. So by the time songs reached the sides they'd pretty much finished
When the Park End was built you could see the effect of proper acoustics, their songs got loud quicker to the point where the rest of the stadium felt compelled to join in with them far sooner than with songs started in the Lower Gwladys St.
So the number of acoustical pens did not matter once the End Stand reached a certain noise level.
So behind the goal you desperately need a different type of stand to the side stand. Single tiers work so much better behind the goal where you need songs to quickly spread under a proper roof, whereas multiple tiers work better on the sides where you want fans to be as close to the noise of the End Stand as possible.
I'm encouraged by talk of this massive Home Stand, though disappointed it's only the one. Though more spy work is needed to see how this home End will formed. Are they thinking of one tier or loads of little tiers?