This is a great pedal for producing guitar harmonies.The pedal foot-switch also acts as an expression pedal when press further.It also has a buffered bypass inside the backside of the pedal (open the pedal back cover and there will be a small DIP switch near the power input jack).However I have notice that when you use this inbuilt buffered bypass (DIP switch ON) ,there is tone coloration .Apart from that this is a high quality,sturdily built and the perfect pedal for creating your guitar harmonies.