I Recently purchased a X910BT and have a question regarding scrolling through file folders. I plugged in a 32GB USB drive, and I have music folders that have up to 400 songs in each folder. Does this unit have a way to quickly scroll down the list to find an artist without having to use the one touch scroll button? I thought I saw where you dan use the volume knob to go up and down quickly through a folder to find files fast. Any help would be greatly appreciated!!!