On April 20, 2007 at 07:08, mtgriff said...
The 7500 has more memory and the buttons look a little
different. Some users say that the 7500 buttons feel different
as well.
... and don't forget the muffler has been removed from the pickup sensor. :-) A slight rattling sound can be heard when the TSU7500 is tilted (a small ball bearing).
