Can you adjust recording levels with it?

My iRiver (with iRiver firmware) has a line-in but connecting it directly to the sources line-out leads to distortion if the VUs approach the red!

A known problem, I've just discovered.

Anyway, I get round this by going through a mixer first and lower the levels that way.

I was wondering though. Does the rockbox firmware enable you to lower the levels? I understand it has 5 AGC settings which may do the trick.

Thanks