Audio manipulation can be further with Zoia. Loopers can go up to 5 octaves (+/- 5 octaves). Audio in can be used as FM, there is pitch detector, audio multiplier (kind of ring mod), enveloppe follower…and these can be assigned to any parameter.
Zoia OS3 brought a sampler module, than can also be used as a looper. But it is beta, and buggy especially with high pitch up.