Harmonium VSTi is based on samples of real Harmonium Organ from 19th century recorded with different position of overtones switches. We also added Analog drift control to add analog touch to samples or to create new vibrato effects . Samples are looped so you can play infinete notes on keyboard without need to pump air with your legs like in original mechanical instrument. Samples are looped so you can play infinete notes on keyboard without need to pump air with your legs like in original mechanical instrument.