"The success of the Moog transistor ladder filter quickly gave rise to a number of 'look-alikes', which employed diodes in the ladder in order to circumvent the Moog patent. Two of the better-known examples are the Roland TB-303 filter [pictured], and the EMS filter, as used in the VCS3 (and probably other models) - this is the 4-pole '18dB' one; later filters had 5 poles, and were labelled '24dB'"via Tim Stinchcombe's website where you will find more info.
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