Extra double sampling cost extra CPU clocks and extra latency.
What's more the currently used saturation algorithm used in sQuad is our latest solution, please compare it to the output saturation used in earlier plug-ins or used by other vendors.
Please notice that it is not meant to be a general purpose saturation machine able to work on high pitched harmonic signals, it is designed to work mostly on transients.
I hope it will help to understand the idea...
The main goal in the sQuad is to get uncommon equalization quality.
Regards,
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Mateusz Wozniak
PSPaudioware.com