hey,
im going to be honest and tell you that this sounds lame.
i don't want to be mean or anything,especially that you have your problems.I'm going to give you MY HONEST OPINION.
If you can't do that in your mind and need a cassette/CD for it,than your mindset is obviously weak.
It can be a bad distraction to hear that stuff over and over again.You won't be able to focus on the decisions and the cassette will interfere with your poker thought process.
Anyway,there is a difference between saying :
I am a person, who always makes a calculated decisions when playing poker.
I breathe calmly, when playing poker.
I play each hand as good as I possibly can.
And actually do it.The "playing the hand the best i can" involves a strong theoretical and mathematical background done off the table and done intensively,repeatedly.
That's my opinion.It's pretty lame.But if it helps YOU out,then do it.