Linking songs with A4

Hi, I need help figuring this out.

I’m working on a song with the OT+A4, so far so good. I have it setup so that OT is controlling A4, so an arrangement i playing on OT and A4 tags along, switching banks when OT does.

BUT, now I want to make another song to start right after the first one. I have figured out how to link songs in the OT Arranger, but how do I change all the sounds on the OT and A4 without having a pause in between and manually assigning new sounds to the A4?

Is the way to go to send program change message to A4? Work with sets? (what if i want more then 4 songs).

Basically what I’m trying to do is to start working on an album but I want all the songs to be playable after each other like a DJ-set. The songs will include different sounds on the A4 and different samples on the OT.
Like
Song 1 = BANK A 1-16
Song 2 = BANK B 1-16
e.t.c

Is there a better approach to this?(I guess it is).

Thanks!