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支持系统：Windows

音源厂商：https://physicalaudio.co.uk/products/tetrad/

独立安装程序 PC

文件大小：7MB

Tetrad 是一款基于物理建模和粒子合成的混合乐器。独特的四路总线信号链为 4 个建模板以及完整的调制矩阵提供信号，营造出鼓励实验的音景。

Tetrad 与您之前使用过的其他合成器截然不同。该插件由作曲家兼跨媒体艺术家 Gadi Sassoon 合作开发，采用四个振荡器，并通过一个类似伪音序器的 Quad AM 处理器、一个专门定制的粒子器以及四个物理建模的板式谐振器进行路由。

Tetrad 的灵感源自 Gadi 的雕塑合成器装置（如专辑《振动模式》中所呈现的），最初是作为实验装置中斜切板和声音发生器的补充而设计的，但如今已发展成为一个插件乐器，将装置的功能集成到 DAW 中的单个软件中。

Tetrad 的工作原理
首先是振荡器，它提供五种模式选择，每种模式每个声部有四个振荡器（因此得名 Tetrad）。在"宏"视图中，您可以更改主振荡器的波形并应用频率调制。振荡器可以根据所选模式进行各种调整，从基本音程到全音阶转位。ADSR 在进入混音器之前提供初始振幅整形。此外，还有一个侧链音频选项，可以旁路振荡器并允许使用任何信号。

4×4 矩阵混音器将四个输入混合到四条总线上。接下来是四重振幅调制，具有深度、形状和速率，可在音频范​​围内良好工作，并且每个总线可以单独设置相位。在 Tetrad 的四重颗粒器中，信号被分割成颗粒，并以不同的方式重放。您可以影响颗粒的窗口形状、大小、音高，并更改颗粒器的反馈。最后，它将信号通过带过载的前置放大器馈送到 Plates 音箱。

功能
– 超过 100 个预设，可立即开始使用。

– 通过基本、和弦、调式和弦、自由和弹性模式生成人声。此外，还为所有振荡器类型提供 ADSR 包络、FM 频率和 FM 深度。

– 四路 AM 模块可对人声进行"伪序列"或轻度调制，并可控制相位、形状、深度、增益和速率（最高 250Hz），以及每个人声的相位位移。

– 四路颗粒器可将四个人声单独或一起合成新的纹理。颗粒大小、反馈、速率（最高 50Hz），或每个人声单独设置颗粒大小和音高。

– 板式谐振器可在虚拟音场上以图形方式驱动和定位。全局设置衰减、金属切割和前置放大器驱动；或按板设置驱动和衰减。

– 全面的调制矩阵，包含超过 ## 个目标、八个 LFO 和三个包络跟随源，以及 MIDI 和 MPE 参数源。

– 三个滤波器 (LP/BP/HP)，用于抑制和修饰音频速率调制失真和极端颗粒伪影的影响。
主页

Tetrad is a hybrid instrument based on physical modelling and granular synthesis. A unique quad bus signal chain feeds 4 modelled plates alongside a full modulation matrix, creating a soundscape that rewards experimentation.

Tetrad is like no other synth you've ever used. Developed in collaboration with composer and transmedia artist Gadi Sassoon, the plugin takes four oscillators, routes them in combination through a Quad AM processor that works like a pseudo-sequencer, a specifically tailored Granulator, and four physically modelled plate resonators.

Inspired by Gadi's sculpture-based synth installation, as heard on the album Modes of Vibration, Tetrad was originally devised as a complement to the slashed plates and sound generators of the experimental setup, but has grown into a plugin instrument that puts the capabilities of the installation into a single piece of software in a DAW.

How Tetrad Works
It starts with the oscillators, which give a choice of five modes, each with four oscillators per voice (hence the name Tetrad). In the Macro view, you can change the main oscillator waveshape, and apply frequency modulation. Oscillators can be tuned in various ways according to the chosen mode, from basic intervals to diatonic inversions. An ADSR provides initial amplitude shaping before heading down to the mixer. There is also a Sidechain audio option, bypassing the oscillators and allowing any signal to be used.

A 4×4 Matrix Mixer blends the four inputs onto four busses. Next is Quad Amplitude Modulation with Depth, Shape and Rate, which works well into the audio range, and Phase set individually per bus. In Tetrad's Quad Granulator, the signal is split into grains that are replayed in different ways. You can affect the grains' window shape, Size, Pitch, and change the Feedback of the granulator. Finally this feeds the Plates through a preamp with overdrive.

Features
– Over 100 presets to get started immediately.

– Generate voices through Basic, Chords and Modal chords, Free and Flex modes. Plus ADSR envelope, FM Frequency and FM Depth for all oscillator types.

– Quad AM module to 'pseudo-sequence' or gently modulation voices, with control over phase Shape, Depth, Gain and Rate (up to 250Hz), plus Phase Displacement per voice.

– Quad Granulator mangles the four voices into new textures individually or all together. Grain Size, Feedback, Rate (up to 50Hz), or individual Grain Size and Pitch per voice.

– Plate Resonators that can be driven and positioned graphically on the virtual sound stage. Set Decay, Metal Cuts, Preamp Drive globally; or Drive and Decay per plate.

– Comprehensive Modulation Matrix with over ## destinations, eight LFOs and three envelope-following sources, plus MIDI and MPE parameter sources.

– Three filters (LP/BP/HP) to curtail and sculpt effects from audio-rate modulation distortion and extreme granulation artefacts.
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