For some decades now, analog filters have had a deep impact on contemporary music. Since its very beginnings, Waldorf has been renowned for the quality of their excellent sounding analog filters. Whether these were integrated in stand alone units, such as the 4-Pole, X-Pole or the AFB16, which enabled the world's first analog plug-Ins, or were found inside our synthesizers such as the Wave, the Q+ or the Pulse - Waldorf filters have influenced the world's sound for over two decades.