One good groovebox with a very capable sampler built in and one of the best synthesizers on Android in one package! Plus high end audio engine and midi in out messages etc...
Google Play:
https://play.google.com/store/apps/details?id=com.planeth.gstomper&referrer=utm_source%3Dtwitt%26utm_medium%3Dreferral%26utm_content%3Ddsale%26utm_campaign%3Dhprm