Best sound quality?
I dunno about that.
rockbox is excellent...I concur...
also xmms with the equalizer and all the tweaks ...
kilikali is excellent too ...loudest...clearest...cleanest I know of .
been using both for years and they are superb.
kilikali is light on the battery in compare too.
I can't recall now...are either of those available for fremantle or is it just chinook/ diablo?
hmmm..actually other than perhaps xmms with easy deb. that is.
If they aren't available ...they should get ported over.
oscp works fine on the nxx0

but man...I have never had a prob with audio players crashing due to the tunes. Crashing due to other issues sure...solvable and it was the players at fault...
I don't think that is the players that is the prob here.
You got some serious prob. with the device I be thinkin'