Guillaume,
I saw Andre perform at Wintergrass in Seattle earlier this year.
While, the videos on Fiddlevideo highlight his talents, I was completely blown away to see him live.
He really has tremendous rythemic skills and sings wonderfully and of course he is a wonderful fiddler.
The board he used looked like a piece of plywood with a frame to raise it off the floor. So that it would resonate. Then he miced it with what looked like an SM 57 microphone. No taps on his shoes.
Perhaps you can send him an email and ask him directly. You can google him, find his website, andrebrunet.com He has a contact template you can use to contact him.
Let us know if you learn anything.
Thanks
George