Anyone know what the disc- (preset 5) and disc + (preset 6) buttons do on the 08 TL with Navi? I looked in the manual and they are noted, but no specific function is explained. The only obvious function I thought it could be would be to select forward or backward between discs, but pressing the actual preset number does that along with pressing the touch screen. Really stumped on this one...LOL.

 

I believe holding them down triggers the "seek" function when listening to CD's