SONICMAN wrote:
> 
> I tried inserting the t 0 240 command then 250 then 260
> etc. nothin' happened? 

Manual snip:
"This statement sets the tempo and specifies the accelerations 
and decelerations for the current section."

This means that you can only have one t statement per section. 
But you can use t to define a sequence of tempo changes, 
as also documented in the manual.