I do not think iReal Pro is suitable either.
I found this app (admittedly for iPhone) and I have seen other ones similar to this that might be more suitable.
https://itunes.apple.com/app/simple-...310708734?mt=8
This one is mainly for iPad (perhaps they will eventually produce a Mac version.)
http://sessionbandapp.com
I assume you want an app for your Mac however but at least you know software developers are aware of what you want.
Have you looked at GarageBand, where you can move measures around to change the order then play it to hear what it sounds like?

If you find anything suitable, post a link back here if you like, so others can follow it up also.
If I find anything else useful I will post back here too.