Google Play Music - re-downloading tracks

Hi everybody, I'm a new member, and I come to you with what I hope is a simple enough question.

Before I activate my 90 day free-trial with Google Play Music, I want to know this. Let's follow this example:

1- my track is "song.mp3" 192kbps, customized tags;
2- upload this to Google Play;
3- delete my copy (the one which was just uploaded) from my PC's HDD.

So here's the question:
When I re-download my track, will it be my 192kbps original copy ?
Or will it be Google's 320kbps copy ? (I'm hoping it's this one, then I can enhance all my tracks' quality this way, as most of my CDs were robbed last time I and family moved out, so I can't remake the tracks anymore to 320kbps, even if I wanted to).

Thanks in advance.

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