I've found this android Midi_arranger app and hooked it to the PX5S.
For anyone interested I recommend to try it out. Although it isn't released
officially still in beta .
It works pretty much self explanatory there are panels and scenes and edit piano roll
to enter notes manual or through midi. ones you've set the channels and instruments
on the app or px5s you can jam and rock on.
I use it as a drum computer so I can use the four zones for hex and tones.
give it a try if you're looking for an arranger app.