Fixed filter banks have been part of the synthesist's armoury almost since the appearance of the earliest Moog modular synths in the 1960s, but they remain misunderstood modules, often employed as little more than graphic EQs. This is understandable; notwithstanding the high and low shelving filters that bounded their frequency ranges, fixed filter banks such as the Moog 907 looked much like graphic EQs with knobs rather than sliders and, with no I/O other than a single audio input and a single audio output, they were little more than sophisticated tone controls — albeit rather euphonic ones. Even the later Moog 914 did little to dispel this idea; it provided 12 rather than eight filters within the high and low shelves but the principle remained the same.
As the name suggests, the AJH Fixed Filter Bank 914 is based upon the Moog 914 and offers the same 12 fixed-frequency filters spaced at approximately half-octave intervals, with roll-offs of 12dB/octave and centre frequencies covering a range from 125Hz to 5.8kHz. And again, a misnamed low-frequency shelving filter sits below this range, and a misnamed high-frequency shelving filter sits above it. (The error is...
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