标题
主题 Compressor envelope modes
The five envelope modes, or signatures, are the key to the sonic character of the PRO2 compressors, and they allow adjustment far beyond the normal capabilities of simple attack and release settings. They largely fall into two application types:
1 Compressors that are good at capturing and controlling dynamic transients: corrective mode and vintage mode.
2 Compressors that emphasise dynamic transients and provide creative control of levels within a mix: adaptive, creative and shimmer modes.
The Vintage and Adaptive compressors tend to morph a little between these two categories depending on threshold control settings. This makes them easy to use intuitively with minimal fine-tuning of the envelope control settings.
Further refinement and enhancement of the envelope modes is provided by combination settings of the three-position KNEE switch. It is best to understand the operation of these two functions in more depth before looking at the detail of the compressor signature switching.
压缩的包络线模式
五种包络模式，或特征，是关键的PRO系列压缩的声音特征，以及它们允许的调整远远超出了简单的攻击和释放设置正常的功能。他们主要分为两大应用类型：
1 善于捕捉和控制动态瞬变的压缩器：矫正模式和复古模式。
2 强调动态瞬变并且提供混音电平的创意控制：自适应，创造性和光控模式。
在复古与自适应压缩机往往顶点变形一点点取决于阈值控制设置这两个类别之间。这使得它们易于直观地使用以最小微调的包络线控制的设置。
结合三个拐点(KNEE)状态的设置提供进一步完善和提高压缩的包络模式。最好深入理解这两种功能操作在关注压缩器细节特征切换之前。
Knee
The soft knee curves behave in a traditional way to blend the compression ratio around the threshold setting (as described above), but more importantly they also have a significant effect on the attack envelope shapes. The soft knee typically slows down attack speed on signals in the knee area, which is desirable for natural sounding compression because it compliments the reduced ratio effect of the soft knee. This produces very gentle compression in the knee region.
The KNEE switch has three settings: hard (4dB); medium (12dB): and soft (40dB). In hard setting the compressor still retains some soft knee characteristics. This is because the implementation of an extremely hard knee produces undesirable sounding distortion on low frequency programme material.
拐点
该软拐点的曲线表现在一个传统的方式混合围绕阈值设置的压缩比（如上所述），但更重要的是它们也具有对攻击信封形状的显著效果。该膝软通常会减慢对膝关节区域，是理想的自然声音的压缩，因为它恭维软拐点的缩小比例的影响信号的攻击速度。这将产生在膝盖区域非常温和的压缩。
拐点按键有三种设置：硬（4分贝）;中等（12分贝）和软（40分贝）。硬的压缩设定里仍保留着一些软拐点特征。这是因为执行一个非常硬的拐点在低频节目素材上将产生不希望出现的声音失真。
Corrective mode (exponential peak - fast)
This is a peak sensing compressor (like many older designs) with exponential attack and release. It produces aggressive compression that gives good fast control and/or limiting of dynamic material. It can be used to add colour to low frequency signals making it ideal for controlling extremely dynamic instruments like the bass guitar. The compressor tends to sound best with fast attack time settings that capture transients and with release adjusted to taste to either emphasise or minimise distortion and pumping effects.
校正模式（指数峰值 - 快）
这是一个峰值感应压缩（像许多早期的设计）具有指数型的攻击和释放。它产生积极的压缩，让又好又快速的控制和（或）动态的素材的压限。它可以用来增添色彩使其成为理想的控制非常动态的乐器如低音吉他低频信号。压缩机往往最好的声音与捕获瞬态和释放调整的味道要么强调或最大限度地减少失真和抽吸效应快速攻击时间设置。
Adaptive mode (exponential RMS - accurate)
This is a root-mean-square (RMS) sensing compressor with exponential attack and release. The RMS averaging process interacts with the attack and release to produce a very adaptive envelope character. This allows faster attacks on large (over-threshold) signal changes and produces slower attacks on small signal changes, regardless of attack time setting. The attack control is still active, allowing some user intervention although the adaptive nature makes envelope control setting fairly non-critical. The compressor is therefore very fast and simple to set up on most programme material. It is also sonically accurate and works well for both compression and limiting of vocals and many other sources. The most natural sounding compression is normally achieved with soft knee settings.
Creative mode (linear peak - slow)
This is a peak sensing compressor with linear (dB rate) attack and second order release. The compressor is very transparent, providing some dynamic control but without unduly affecting the intentional dynamic content of the source material. The linear attack provides a constant rate of attack, such that large changes in programme signal level take longer to become compressed than smaller changes. Adding soft knee noticeably delays these attacks, which can be particularly useful on drums where compression can be applied to emphasise transients giving more punch while retaining a good deal of artistic dynamic from the drummer.
The compressor normally sounds best with slower attack time settings, when it can be used on difficult instruments, such as the acoustic guitar, with relatively fast release to keep equal perceived loudness within a mix without producing excessive flutter or distortion.
Vintage mode (adaptive peak - bright)
This is a peak sensing compressor with a partially adaptive nature. It produces extremely subtle attack and release curves during the onset of compression that are largely independent of the envelope control settings. However, as it is driven harder, that is, signals are further over-threshold, the attack and release times become more aggressive and gradually return to manual control so the operator can optimise the capture (or otherwise) of larger transients etc. The peak sensing algorithm intentionally increases harmonic overtones during compression, which adds a valve-like brightness and sparkle to the programme, producing extremely natural and lively sounding compression of acoustic instruments.
复古模式（自适应峰值 - 明亮的）
这是它的发生压缩基本上独立的包络控制设置时会产生非常微妙的攻击和释放曲线。然而，由于它的驱动困难，也就是说，信号是进一步超过阈值时，攻击和释放时间变得更激进和逐渐恢复到手动控制，使操作者可以啤酒瞬变等的优化捕获（或其他方式））这种峰值感应的算法刻意增大压缩时的谐波泛音，增加了像电子管一样的明亮和光辉到节目内容里，使原声乐器的声音产生非常自然活泼的动听压缩。
Shimmer mode (overshoot peak - slow) - output only
This is a peak sensing compressor with an exponential release and unusual second order attack character that tends to overshoot.
If used sparingly, the compressor sounds very soft and natural and can provide additional control of material that already has a fairly low dynamic content. It can sound very transparent on vocals where it retains a good degree of life in the performance.
If used at higher ratios with slow attack and fast release times, the compressor can produce a very soft bouncy sound character.
光控模式（过冲峰值 - 慢） - 仅在输出使用
这是一种峰值感应压缩,呈指数型释放时值和不同寻常的倾向于过冲的二级攻击特性。
如果谨慎使用，这种压缩的声音非常柔和自然，并能对一个动态已经较低的内容素材提供进一步处理。它能使人声听起来非常透明，在演出中保持适度的活生感。
如果在较高的比例与慢的攻击速度和快的释放时间使用时，该压缩可以产生非常柔和有弹性的声音特性。