Analogue-sequencer

Hello

I am using a nova with the P3.
I have created six different sequences on six different channels (so
using six different tracks) and i want them to play at the same time.
I would like to controle manually the volume of the six tracks so that
i can fade in and fade out some tracks whenever i want.
With the nova i can't do both at the same time because there is only
one knob.
Can i use the P3 as a controler while he is busy with the sequences?

Thanks