Aha, I asked a lot about these horns when I was over there. What I was told is that they are old hunting horns left behind by French colonizers. The hunters may have traded them with the villagers. I tried to buy one over there but I was told that most villages would only have one if they even had one. I saw standard whistles being used in much the same way over there.
I had a look on Ebay and in various places for one.
http://cgi.ebay.fr/trompe-de-chasse-/22 ... 336bec42bb
I reckon something like this would sound similar. I'd love to get one, let it rip during Gbada!
An awful idea came into my head during a fete once:
I could introduce the Vuvuzela to Guinea
For those of you who don't know what a Vuvuzela is, it's an incredibly loud plastic horn which is popular at South African football matches. It's based on a traditional type of horn. They had to ban them from the Euro 2012 cup because of the insane noise they make, distracting players and causing hearing damage to fans.
[video]
www.youtube.com/watch?v=Pjv_UfIHm0s&feature=related[/video]
Anyways, it occurred to me that they would probably catch on like wildfire in Guinea and I'd be singlehandedly responsible for ruining Guinean music.