The T-series have additional master keyboard functions. Due to the big display, which can show graphics, the sound programming is much easier as on a M1. The Ts can use all of the M1-sounds but not vice versa. The Ts have a floppy disk drive.

The Ts are great for live performing. I use a T2 and control all of the MIDI-instruments with it (other keyboards, effect units and programmable guitarre staff). It is good to have a floppy drive availabe on stage, you can use it for backup and restore sounds (keyboards, effect units and so on).

T3-60 keys,
T2-76 keys,
T1-88 heavy keys.

EX-Option means, you can load sampled sounds. These sounds have to be loaded each time you power a T machine on. Need more infos?