By Jailene Cuevas Rocker Jon Bon Jovi said he turned to “voodoo” and all sorts of experimental medicines and methods to fix his voice in a bid to avoid surgery. The singer is still in recovery after going under the knife having taken the drastic step of vocal cord surgery almost two years ago. But in good news for fans, he has told how the band is back rehearsing to test his voice with a view to going back on the road. Jon, 62, revealed: “The guy that I found in Philadelphia, the greatest thing he said after I exhausted everything, every bit of what I call ‘voodoo.’ Every Eastern medicine, eve…