In a large saute pan, melt 4 tablespoons of the butter. Add the brown sugar and stir until the sugar dissolves and is bubbly. Add the pecans. Season the pecans with salt, cayenne, nutmeg and cinnamon. Continue to cook, stirring constantly, until the sugar starts to caramelize and coat the pecans evenly. Cook for about 4 minutes. Remove the pan from the heat and spread the pecans over a parchment lined baking sheet. Place the pan in the oven and roast the pecans for about 6 minutes. Remove the pan from the oven and cool completely. Break the pecans into small pieces.
Fill 3 small saucepans halfway up the pan with water. Place the pans over medium heat and bring to a boil and then reduce to a simmer. In three separate mixing bowls, add each type of chocolate into each bowl. Place the bowls over the saucepans. After about 2 minutes over the heat, the chocolate will start to melt. Stir each chocolate until totally melted. Remove the chocolate from the heat and stir 1 tablespoons of butter into each bowl of chocolate. Pour each type of chocolate over a large parchment paper-lined baking sheet. Sprinkle the pecans and hcerries over the chocolates. Using a metal spatula, spread the mixture out evenly back and forth to about 1/4-inch thickness.
Place baking sheet in refrigerator until set, about a couple of hours. Break the bark into medium pieces and serve.