After much, much more controlled testing. The 'music_dynamic_attack_CI_num' convar has revealed itself to be far more convoluted than I had initially presumed. As user botian so helpfully pointed out to me: the value of the convar did indeed, not directly correspond to the amount of common infected. Proximity also did not play a factor, like I had previously thought so.

It appears the threshold works more like a hidden CI (common infected) DPS (damage per second) check. Though instead of being measured in seconds, the accumulative CI damage value quickly decays at a set interval.

To keep things comprehensive let's just say this system "ignores" damage modifiers (it doesn't, and this is a gross oversimplification). It will require the same amount of attacking CI no matter the difficulty, to surpass the "DPS" threshold.

I had also neglected to take into account the impact of changing the infected's 'z_throttle_hit_interval' convars. Which evidently tampered with the results of my initial testing. To hopefully spare others from this headache I have addressed this caveat in the 'Potentially Conflicting Mods' section.

The new set value should now trigger after roughly the fourth common infected, not third; as the mod was previously doing. That was never the original intent, and was simply a mistake on my part.

Again, I want to thank user botian for their very helpful input. I have also amended the 'Chinese Mod Description' section to accurately reflect the new results. Though I had to cut the quote down again unfortunately. The workshop description's character limit forced my hand (I'm sorry).

Speaking off... I am aware the track's volume can further increase past the initial trigger. But omitted this detail as the workshop's description was already long enough. Just thought I'd mention it because botian's original comment also brought it up.

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