固定滤波器组的目的是增强合成器的主信号，在特定频率添加谐波或在其他频率去除谐波。有些人想要全新的、前所未有的声音景观，将自己和观众推向音乐体验的新世界。其他人希望创造更传统和熟悉的声音，同时仍然突破界限，利用传统"未插入"乐器中没有的新电压控制、功能和特性。有些人两者都想要。
输入重新设计的P915 MEDUSA固定过滤器组。一种滤波器，为信号添加微妙或不那么微妙的共振，或完全去除频带。当这个过程与未改变的"干"信号混合时，可以模仿传统仪器的实际行为。它还可以作为其他滤波器结构中没有的独特和创造性的声音整形可能性来源。
915的几个硬件克隆主要基于有源滤波器设计结构。915的原始结构使用简单的电感器、电容器和电阻器作为滤波器单元，在半导体的无菌世界中失去了微妙的相互作用。然而，基于原始结构的设计亟待追求。找到了电感器的来源，仔细检查了原理图，清除了复制原理图中的错误，设计了电路板，结果是Moog在其原始用户手册中发布的原始响应的极其准确和忠实的副本。
有了可靠的硬件版本，软件模型就可以开始了。对硬件的仔细表征和测量，以及保持Moog FFB独特结构和两级设计的软件模型，使软件模型忠实地匹配并遵循了原始模型。添加一些额外的功能，例如能够将每个单元格的输出定向到左或右通道，开辟了额外的可能性，增加了过滤器的魅力、实用性和特性。
P915的设计、实施和质量控制是与Analogue Realities的David Ingebretsen合作完成的。P915 MEDUSA简单明了，是电感器915固定滤波器组的一个细致的实施点，但在功能、可用性和性能方面达到了一个新的水平。
The intent of the Fixed Filter Bank was to enhance the primary signal of the synthesizer, adding harmonics at specific frequencies or removing them at others. Some wanted completely new and never before heard sonic landscapes to push themselves and their audiences into new worlds of musical experience. Others wanted to create more traditional and familiar sounds, while still pushing the boundaries and making use of the new voltage controls, features, and character not available in a traditional "un-plugged" instrument. Some wanted both.
Enter the new reimagined P915 MEDUSA Fixed Filter Bank. A filter which adds subtle or not so subtle resonances to the signal or removing frequency bands altogether. This process, when mixed in with the unaltered, "dry" signal, can mimic the actual behavior of a traditional instrument. It can also act on its own as a unique and creative source of sound shaping possibilities not available in other filter structures.
Several hardware clones of the 915 were being introduced primarily based on active filter design structures. The original structure of the 915 used simple inductors, capacitors, and resistors for the filter cells, which delivered a subtle interactions were lost in the sterile world of semiconductors. However, a design based on The original structure was begging to be pursued. A source for inductors was found, the schematics were scrutinized, errors in the schematics from copying were weeded out, circuit boards were designed, and the result was an extremely accurate and faithful copy of the original response as published by Moog in their original owner's manual.
With a solid hardware version in hand, a software model could begin. Careful characterization and measurement of the hardware, along with a software model keeping the unique structure of the Moog FFB with its two stage design, has resulted in a software model that faithfully matches and follows that of the original. Adding some extra features, such as being able to direct the output of each cell to either the left or right channel, opens up additional possibilities that add to the charm, utility, and character of the filter.
The P915 design, implementation and quality control was in collaboration with David Ingebretsen of Analogue Realities The P915 MEDUSA is simply put, a meticulous, spot-on implementation of the Inductor 915 Fixed Filter Bank but taken to the next level in functionality, usability and performance.
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