CMS 4012CX
A voltage-controlled filter module designed for use in modular synthesizers, notable for its dual-mode operation and discrete transistor construction.
Overview
The CMS 4012CX is a voltage-controlled filter (VCF) module manufactured by CMS (Discrete Synthesizers). It serves as a standard component in the CMS 2607 synthesizer and is part of the 4000 series sub-module design, which ensures compatibility with the original ARP 2600. The filter is described as "famous" and noted for delivering improved sound while remaining faithful to the early ARP 2600 filter design.
Design
The 4012CX filter features two operating modes: CMS and ARP. In ARP mode, it preserves the original factory 4012 circuit, while CMS mode utilizes the CMS 9004 dual-mode filter. It includes a High Pass / Pseudo-notch output that varies with the mode switch setting. All audio processing is handled by discrete, hand-selected, low-noise, matched transistors. Built with reliable thru-hole construction, the module adheres to the 4000 series sub-module standard, making it interchangeable with the original ARP 2600.
Specifications
| Product Type | Filter (specifically, a voltage-controlled filter module) |
| Manufacturer | CMS (Discrete Synthesizers) |
| Product Name | CMS 4012 CX filter |
| Module Series | 4000 series sub-module design |
| Compatibility | Interchangeable with the original ARP 2600 |
| Filter Modes | CMS mode (uses CMS 9004 dual mode filter), ARP mode (original 4012 circuit) |
| Outputs | High Pass / Pseudo-notch output depending on mode |
| Construction | Thru-hole |
| Audio Processing | Discrete, hand selected, low noise, matched transistors |
Context
The CMS 4012CX is a core component of the CMS 2607 synthesizer and part of a modular system designed to maintain compatibility with the ARP 2600 through the shared 4000 series sub-module architecture.
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