App different rhythms on the same track

[Swiip64]

Hi everybody,

I am really stuck on my Ipad because of rhythms, I mean on a lot of my songs I have 2 rhythms, and even 3 on one so my quesion is :

Is there any app which could implements a metronome with evolving rhythm on the same track?
Example : 120 bpm from 0:00 to 0:45, 150 from 0:45 to 1:10 etc...

Like this I will be able to work with my musician friends through the web with rhythms I want for our songs...


Thank you for your help,

Krs Ben