....an obvious suggestion is to double to 12 ......but we all know that we should estimate a requirement and then double it .....so I'd say ableton could do with 20 slots .....
If you are running an iPad as a control surface the amount of apps that you can use all needing there own slots is amazing ...touchable ....Griid....Live control .......Touch o/c .....Etc etc
....cheers
D