This multi track synthesizer / sampler application is the number one choice for anyone looking to work in different time signatures and poly rhythmic mayhem.
Actually it is one of the few fully featured apps as it contains multi track / synthesizers and sampler plus a good selection of effects and can be a good alternative to Caustic / SunVox.
If you have not tried it there is a free version and the full version is very cheap.
Here is an in depth review that I recommend that you read:
The update contains:
Make off-guide steps visible and editable
Display NOTE PROPERTIES when step long-tapped
Allow steps to be moved with long-tap and drag
Fix LOOP STEPS display of short steps in expanded element
Fix ALL TRACKS view after track created
Allow positions and lengths to be specified with mixed fractions
Improve LOOP STEPS render performance
Play Store link: