[Haskell-beginners] How to interact with a process

[Martin Drautzburg]

Hello all,

I know how to play a Midi file. I also know how to read the keyboard. But I 
don't know how to bring the two together such that I can start and stop 
playing from the keyboard.

It is not required (just nice to have) that the console remains responsive 
while the midi file plays. But it is essential that I can stop the 
performance.

Is this difficult?
-- 
Martin