-- | Stacks the channels of two audio files together.
merge :: Audio r c1 -> Audio r c2 -> Audio r (c1 + c2)
merge x y = merge' (1, x) (1, y)
merge :: Audio r c1 -> Audio r c2 -> Audio r (c1 + c2)
merge x y = merge' (1, x) (1, y)
merge x y = merge' (1, x) (1, y)