Available as an assembled Module and as a DIY project.
This Module is currently available.
Logic Module
Logic module built around the CD40xx logic function chip series. The logic function can be chosen through replacing the IC on the backside. Nor (4001), Nand (4011, 4093), Or (4071), And (4081), Xnor (4077), Xor (4030, 4070). Produces ring modulation effect at audio rate.
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RT Logoi$312.65
Behringer Space FX - Front Panel