Ctrabass trombone "duophonic playing"

[civilization 3]

under the fluttertongue category for the full v.

I have no idea what this means 

[civilization 3]

I suppose it could be like that one tree in Clarinet 2, which are two sounds, one morphing to the next.

odd word, no search has revealed, with the other meanings

[PaoloT]

They are sound+voice together.

Funny that I had asked for this just half a minute before reading your post! Great finding!

Paolo

[civilization 3]

thanks for that.

so I bought the thing