I have a Power Bugle by ELK, I got it after shooting my elk in ID this year, spent 10 minutes with the outfitter and the next AM called in a bull. Pretty easy to use, but I never could get it to do a chuckle.

For a bugle tube, the power bugle mouth piece comes out so it doubles as a tube if you can blow a diaphram call.

The outfitter used a 8-10 inch piece of pvc pipe for a tube and it worked GREAT.

--Bob