Tamang tones

Hello all,

I'm starting on a new project, a naturalistic tonal language. Right
now I'm just trying to educate myself about various types of tonal
languages, so I have a firmer grasp of how they work before I start
designing one of my own.

I've seen some intriguing references to Tamang, and I'd really like to
know more.

Is anyone here familiar enough with Tamang to give me a basic
description of its tones? I'm not having much luck with Google.

--
Katya