Tiptop Audio have painstakingly re-created the vintage voltage of the West Coast synthesis pioneer’s 257 Dual Control Voltage Processor, with the 257t. With Buchla’s blessing, the iconic – and often esoteric – design ethos is now available in a fully-compatible, 14HP Eurorack module, uncompromising in delivering the full scope of voltage manipulation offered by the original 257. Like its historic counterpart, the 257t utilises two identical, independent sections of CV modulation, boasting a straightforward interface undergirded by complex mathematical equations to produce wildly compelling sonics. Voltages are blended into a singular output, with addition, subtraction, scaling, inversion, and multiplication processes, as well as voltage-controlled transfer between two CV inputs.
Model 257 Dual Control Voltage Processor consists of two identical sections, each of which permits several applied control voltages to define a single output voltage according to the equation: (Va * K) + ((Vb * (1-M)) + (Vc * M)) + Voset = V_out.
The algebraic manipulations possible with this module include addition, subtraction, scaling, inversion, and multiplication. Also incorporated is the capability of using one control voltage (M) to transfer control from one applied voltage (V_b) to another (V_c).
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