The Buffer is always on. The On/Off switch only activates/deactivates the 3 Band EQ.
Controls :
Low : Counter-clockwise for less low frequency, clockwise to increase lower frequencies. 100 Hz Shelf
Mid : Counter-clockwise for less Mid frequency, clockwise to increase Mid frequencies. 500 Hz Bell
High : Counter-clockwise for less High frequency, clockwise to increase High frequencies. 2 KHz Shelf
9VDC
