There's install instruction under “How to Use” and example code in the .ipynb files. It's mostly geared towards TTS, but it seems to work with voice recordings too.
newtype X = X (IORef Int)
instance Num X where
fromInteger = X . unsafePerformIO . newIORef . fromInteger
instance Eq X where
(X a) == (X b) = unsafePerformIO $ do
x <- readIORef a
y <- readIORef b
writeIORef a $ x+1
return $ x == y
ghci> a <- fmap X $ newIORef 1
ghci> a == 1 && a == 2
True