How do the BritStrings sound choral?

[dc2k]

If someone could check this out on your PX 5s, I'd appreciate it. 
Load up the HEX tone 089 which is called Choir Tone. 
Edit it and you'll see layer 1 and layer 3 are on. 
They're both set to different BritStrings tones (1 & 2) which I'm guessing stands for brittle strings. 
But how are they being made to sound like a choir?
They clearly make clearly vocal ahhh type sounds like a choir. 

[Brad Saucier]

I'm thinking bright strings.  Keep in mind there was a firmware update which added some additional waves, which changed the numbering of the wave list, and this affected some of the preset names, where they might not have the correct name.

[dc2k]

So you think maybe somehow the update caused choir1 and choir2 (tones 141 and 142) to be displayed as britstrings 1 & 2 in the choir hex tone. 
Think maybe you're right. The choir1 tone on 141 gives the same tone and if you change the tone and then reselect bristrings1, it's completely different. 
It's an interesting hex tone when you mess around with it, like the sample seems to change if you go from EFlat2 to E on layer 1 and at a different key on layer 3.