You can set the arp to major and minor scales on the octatrack, I saw a post from @Open_Mike maybe? that explained how to set it to get more scales out of it. I’ll look for the post now. I would very much like it if elektron added scales, I don’t think it’s that it would be hard to implement at all, I think it’s more to do with encouraging use of the boxes as a musical instrument. kind of forces people to learn. Still though it would be nice for an ease of use thing, I just use maschine to fill that gap but it’s missing some exotic scales. Other alternatives are MPC live/X and if you’ve got an iPad beatmaker 3 has a more extensive 64 pad scales mode, it has a great chord mode too but it doesn’t send the chords out over midi unless you press all the pads 
MPC 1000 has chord mode but no scales. I wonder why this feature never seems to be implemented fully
Edit: found it