Reader Gianni Proietti (gattobus) shared this in-depth tutorial that looks at music production using a Roland Eurorack modular synthesizer. 

The video demonstrates creating bass, arpeggio, FX & lead using a Roland Euro system, made up of a Roland System 500, System-1M and AIRA FXs (Scooper, Bitrazer, Torcido, Demora).