Miracles do happen - even I found a bagpipe I never ever heard of before - on the CD “Mother Volga”, a collection of Volga-Ugric music (Mari and Chuvash): The SURNAI.
Unfortunately (or maybe not that unfortunately since it’s played together - or rather against! - a Chuvash Shopor with a tonal difference of a 2nd!!! 
), the track is only 25 seconds long (short). It’s a re-issue of a 1950 recording of ethnic music from the UssR - just like the small photo (2inches x 1,5), where one of three musicians holds such a Surnai, and You see it slightly from the side. Informations of the liner-notes are not clear - some may be lost in translation from Chuvash to Russian, then 50yrs later to English: It says: “Triple-chantered”, “triple-chantered with drone” and “three pipes”. Considering the photo and the recording, only the last description seems correct: You see a small bagpipe with a bend mouthpiece, a wooden chanterstock with almost a 90 degree bend and a decorated hornbell, and two drones with metal-fittings - a tenor on the left arm, and what seems to be a soprano on the right.
I didn’t find anything else on the internet - does anyone know more (or know anyone, who might know more) about it? 
Thanx in advance! 