Changing the battle bgm when low helath & essentials FP

I'm going to start with the second thing in the title.
Essentials false positive.
Extendtext.exe is being detected by my virus protector, Malewarebites. I don't mean to scare anybody, I'm pretty sure it is a false positive, but I just wanted to let the essentials staff know and ask why?
As for the second thing.
I am blind and find it quite annoying that no measures have been taken to replicate the low hp sound/music in Pokémon mainstream games.
I could understand Maruno not adding the low hp noise because "it is annoying", but now that we have the music that isn't very annoying, why not add it?
But anyway I'm not here to make suggestions.
I'm here to ask if somebody can help me impliment this.
I need it to play lowhp1.ogg when the Pokémon's health is low enough, unless switch 500 is on, in which case, it plays lowhp2.ogg.
I plan to try to learn RGSS so that I can do this kind of thing without help, but until that happy day, I must ask people who know what they are doing :)