@ w0lverine: I am admittedly a tad OCD when it comes to hissing. The rational part of me knows full well that once the music starts playing, the hiss is essentially entirely covered up, but somehow I have convinced myself that it is still there in the background, detrimentally affecting my enjoyment of the music... I know it's silly, but this is the sort of pedantry that sets us audiophiles apart from sane and practical people, right?
I'll probably buy the volume controller today, I'll keep you guys informed.
Thanks, it's a always a pleasure to learn with you guys !