I got inspired by other people using the Poly iOS app in their improvisations, so I decided to try it myself.
The Poly app generates notes in a defined range, resulting in polyrhythmic patterns. These notes are sent via MIDI to the Volca FM, which itself plays a loop of a few notes. I decided to with the Xylophone FM patch, without extra edits, just knob tweaking. The FM is connected to the Zoom MS-70CDR, which adds the delay and reverb. The output of the Zoom is sent to the Behringer UCA202 USB sound card, which is in turn connected to the iPhone 7 that is used for recording the video and audio.
Poly app: http://cargocollective.com/mvstudio/POLY