Slower attack times also help the processor ignore small, brief transients in busy signals. In the Transients section, there’s an attack time control that can be slowed to allow some of the existing transient to pass through before gain reduction kicks in, much like the same control on a compressor. Alternatively, the display section can be used to view the frequency curves for the attack and release processing. It is also possible to freeze the scope display for closer examination by clicking anywhere inside the scope display. By default, the envelope scope scrolls smoothly from right to left, but you can switch to a bar-sync mode for tempo-controlled projects. One of these is a type of oscilloscope showing the audio waveform overlaid with the attack and release envelopes, which provides very useful feedback as to what the process is achieving. Envolution’s main display, in the centre of the window, can be switched between several different views. Each knob contains a circular meter display which shows the varying level of the gain envelope. Two main level controls allow independent adjustment of the transient and sustain components of the input signal. There’s also a decent library of factory presets, which cover many eventualities as well as providing an insight into how best to adjust the plug-in. Sonnox have done as much as possible to take the hard work out of setting this plug-in up, so it automatically adjusts its detection and processing time constants according to the characteristics of the input signal. An iLok account is needed for authorisation. All the usual native plug-in formats are supported, and there’s also an AAX DSP version for those running Pro Tools HDX rigs. This processing doesn’t use the usual band-splitting and there are no FIR filters, which means that it can be used in a parallel routing configuration without you having to worry about phase cancellation or long latency. What’s more, the processing can also be made frequency-dependent, which can be useful in tackling issues that affect only a certain part of the spectrum. The Sonnox Oxford Envolution plug-in takes this concept and runs with it, providing detailed and separate control over transients and sustain and allowing attack, hold and release times to be adjusted independently. Originally a hardware processor and later emulated in software plug-in form, it allows independent control over the attack and release characteristics of a percussive sound, without the user needing to set a threshold. Many of our readers will be familiar with the SPL Transient Designer. Most of us are familiar with transient processors that can shape the attack and release characteristics of percussive sounds - but Oxford Envolution goes much further.
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