- "...the volume of each layer is determined by the current threat. As threat increases above 5%, the first (lowest-order) layer will begin playing, followed by the second layer, and so on. Threat music does not play below 5% threat." - "The track to be selected from a given layer is random and only changes when the region is reloaded. A track cannot be selected if it was already selected on a previous layer." - "...if the threat level is 60%, then 60% of the layers will be audible; if this results in a non-integer number of layers, the fractional part dictates the volume of the highest-order layer, while the lower-order layers will be at full volume." technically this is how it should be (THmode 1) THmode 1: follows the second paragraph THmode 2: includes all tracks in a single layer THmode 3: each track is its own layer RW_TH: follows further rules related to THREAT%
