I cannot praise this software-sequencer enough. It has become essential to my workflow.
While others often seem to lack in some aspect, this one has it all. Modulation, randomization, polymeters, chords/scales, probability options galore. You can chain your sequences in multiple ways or trigger them in any order from Ableton Live. There are lots and lots of nifty quality of life functions, for example dragging the mouse to enter parameters quickly, modifier-clicks to change multiple note's parameters, right-clicks to enter preset modulation-curves, stuff like that.
The thing I like the most is how logically the functions are implemented which makes Stepic easy to grasp and so much fun to use.
The price is a bargain.
Responsive developer who takes his customers seriously.