Replaced the chip with a J4558 and switched two resistors in my TS9 today. Plus the 3pdt and brighter LED and I've got a sweet TB TS808. I noticed something funny, when I removed the old chip, a (TA?)75558P, underneath it printed on the board it said "4558". Do all Ts9's have that? "It's ironic- I used to play in my bedroom pretending I'm onstage; now I play onstage and pretend I'm in my bedroom."