Scale Changing Portable Harmonium automatically sets when the musician plays a particular note and the sound of the same note of lower octave. The Portable Harmonium is designed with three standing notes and nine hinges for high quality sound. The Portable Harmonium has seven folded below and two sets reeds, one is horizontal and another one is vertical. Scale Changing Portable Harmonium is available in a locked suit case that helps to keep it dust free and enables ease of carrying it while travelling.