(1). FX effect status indicators LED need to workwith【1】 rightfootswitch. (2). If it is forward playing and the effect is on, red FX LED lights up. (3). If it is reverse playing and the effect is on, green FX LED lights up. (4). If effect is off, FX LED goes off. 1/4″ Right inputjack, connect guitar. 1/4″ Right output jack, connect amplifier. 1/4″ Left input jack, connect guitar.