This is great find Fiann of the Silver Hand!
I went through everything and BGT doesn't touch sound slots in conversion, so 69 IDLE_1 goes to 69 PICKED_POCKET.
So I tested all in BGT, and if you copy StringRef from 69 PICKED_POCKET to 70 HIDDEN_IN_SHADOWS
and 71 SPELL_DISRUPTED, chanters start singing!
Try with attached CHANTE.CRE.
They are not singing at rate from BG1, but they are singing.
Tried all slots from 70-73, but if it is in just single slot, nothing happen.
Maybe some other combination works better.
And it could be easy fix in BGT.tp2, just before BGT copies every CRE from bg1cre to override, if creature has IDLE_1 slot filled, copy it to correct slots.
Naming of sound slots in NI needs to be updated (at least in BG1), if we know correct naming.
Edited by Mad Mate, 01 June 2015 - 02:31 PM.