[PD] duration for midi notes

[Oded Ben-Tal]

I am getting some wierd behaviour when outputing midi notes. Changing the 
duration parameter doesn't always change the duration of the note. I 
started exploring the help files to check (metro object send constant 
stream of 60, I used a number box to change duration) initially changing 
duration produced longer notes but after 10-15 notes they became shorter 
again (sound like it is reseting the value).

any ideas?