MIDI Arranger Demo is a music creation tool, an auto accompaniment software also known as an arranger. It comes with a GM1 sounds library and support for SoundFont 2 so you can upload your own sounds. It can also connect to an external synthesizer via MIDI.
The demo version stops playing after one minute.
Try it before you buy the full version: https://play.google.com/store/apps/details?id=com.iov.midiarranger.paid
MIDI Arranger group on Google Groups:
https://groups.google.com/g/midiarranger
MIDI Arranger group on WhatsApp:
https://chat.whatsapp.com/DjWU7WFKzClC28ZKdwarwx