The vogue these days in computer audio (and one I am not immune to) is to distance one's sound from the digital domain as much as possible. Countless virtual emulations of vintage gear are released seemingly every week and marketed as the perfect marriage of analogue authenticity and digital cost effectiveness.
One unique sub-genre of these vintage plugins are the
analogue summing mixer emulations; designed to recreate the enhanced
sense of depth, width and punch a mix would have if it were run
through and summed on an analogue desk. Although there are several
virtual consoles out there, this article (at least for demonstration
purposes) will largely revolve around the Steven Slate Digital
Virtual Console Collection and the Waves NLS.
What Are They?
Almost every version of console emulation comes as a bundle of two plugins, one for the channel strips and one for the mix bus. The set up is to simply place a channel plugin on each of the channels and the bus plugin on the output.
The channel plugins can be placed as either the first or last insert (to emulate mixing or tracking respectively), while the bus plugin should always be placed first in order to replicate an unaltered sum. These plugins will not do any summing of their own (some confusion has been created by the Nonlinear Summing title of the Waves version) but will alter harmonics, EQ curve, saturation, crosstalk and noise level in a nonlinear way dependent on source material frequency and level.
The most important control in any of
the emulations is the console type. In the Slate version there are
five different types of consoles to choose from with unique
characteristics (for some legal reason I presume, each is codenamed).
The Brit 4k is an SSL clone, the US A is an API, the Brit N is a
Neve, the trident symbol is, not surprisingly, a Trident desk and the
RC-Tube is a 1950's all tube broadcast console. The NLS also covers
Neve and SSL as well as an EMI emulation.
In the VCC the Input control will
increase or decrease incoming gain which in turn changes the effect
the channel and bus plugins have on the audio. The Drive control
will increase or decrease the intensity of the effect without
altering gain. It is also possible to denote channel groups and
slave them to a single control which will uniformly change group
parameters across the board. Assigning the mix bus to a group is
The NLS is somewhat different in that it contains only the Drive knob which acts as the input knob in the VCC. It also contains an output slider to adjust the signal sent to the summing bus post channel strip.
Slate's Advanced Options
The Calibration panel in the Steven Slate version allows for configuration of how the console will react to input level either globally or by group. Here, you can adjust the console to react to lower level signal as if it were being driven hard or vice versa. The Rel LED sets the calibration to react relative to the global calibration level, the Abs LED sets calibration to an absolute value, irrespective of the global setting. The On LED activates the particular group calibration and the slider determines the intensity.
The Output panel provides control for desk noise (turning hiss on or off when there is no signal), desk level according to type, control over the level and sensitivity of the level Clip LED as well as a control for the responsiveness of the VU meter needles.
The Oversampling panel provides a variety of oversampling options for rather dramatic effect. As is, the plugin will not oversample and sounds pretty good. However, by oversampling one can achieve a more realistic emulation of the analogue desk (or so claims Steven Slate). There are options to oversample by 2, 4 and 8 times in both offline and realtime rendering.
Here is a quick blind taste test between the Waves Non-Linear Summer and the Slate VCC. Both emulate a Neve and SSL desk so I've chosen those for an apples to apples comparison below.
The dry loop
Neve Desk 1
Neve Desk 2
In both tests, the VCC is second. I actually prefer the Waves Neve in this instance, but after demoing it for
sometime, I did feel the NLS tended to generally over color the sound, which brought me to my purchase of the VCC.
One cool thing about the NLS that is
not present in the VCC or other emulators that I am aware of is that
around 30 different channel strips from each desk were modeled. If
set up properly, Waves will randomly select from this pool to give up
to 30+ unique channel emulations per project. Waves also offers a
duel mono mode in the NLS which creates a slight variation between
the left and right channels, further widening the stereo field.
Below are samples of the same kick and
snare loop run through both the NLS and VCC. I changed no parameters
other than the desk type.
A hybrid I made of the VCC with the kick running through the tube, snare running through the Trident, the Neve handling the hi hat, and the mix bus set to API.
The hybrid oversampled by a factor of 8. The snare and hi hat sound quite a bit more clear and distinct.
Should You Buy One?
In all honesty, the only people who really know how closely any of these emulations come to recreating the sound of a vintage piece of gear are those who actually have access to the gear being modeled. For my money though, it stands to reason by virtue of the laws of competition that they are not too far off, or at least close enough to make dropping $150 or so a worth while investment.
Two other contenders I have not yet mentioned are
the Sknote Stripbus and the Acustica Nebula (not quite the same
thing, but can be used as such) which I have not tried but have
heard good things about. So by all means demo them out and decide
for yourself if it is money well spent and a sound worth pursuing.