The HoTone Soul Press II is a very comfortable pedal. 3-in-1!!! There is a separate sound switching, wah-wah and wah-wah sound together. The pedal is very stable and durable. Works both through an adapter and with a 9v battery. Without connecting the audio cable, the battery is not used. When the audio cable is pulled out of the socket, the power from the battery is automatically turned off. Very comfortably. I use the pedal with keyboards, acoustic and electric guitars, and harmonicas. I am very glad. Thank you.