Is there any Sampler Groove/Rhythm machine or software/app having the following features:

1- Can load the audio loops/beats (e.g wav.) in different variations
(like A, B, C, D, 1, 2, 3 etc), which are switchable in real-time
when playing (on the fly) in perfect timing.

2- Can be MIDI synchronized with an external instrument midi clock as
a slave or master.

3- Can be able to change the tempo of audio loops/beats.

4- Have enough memory to store the audio (sample) loops.