Make normalizing / casting array easier

[cool-RR]

I'd like to give a talk in EuroPython 2020 where I'll use simpleaudio to do live-coding of a music synthesizer. There are just a few things I need to make easier.

I'd like to cut this part out:

audio *= 32767 / np.max(np.abs(audio))
audio = audio.astype(np.int16)

I know it's used to cast the float array into int and normalize the audio data. I'd like to have as little confusing code as possible. Would you be open to a normalize=False flag on the play_buffer function that accepts any NumPy array and automatically does this process on it?