2023 is a special year, because it’s Boss’ 50^th anniversary! Consequently, they have released special editions of some of their most popular products in celebration. The SD-1 is Boss’ Super Overdrive which is ideal for all players as it’s a very versatile pedal. The SD-1 has the revolutionary asymmetric clipping circuit from the OD-1, Boss’ first overdrive pedal. The SD-1 produces a rich and smooth sound. The pedal can produce beautiful hard sounds but also more mellow sounds for genres like jazz and blues. With the knobs you can alter the sound very easy.