I downloaded the Soundcraft MKT-12 recording manual (there is also a user manual available for download). The recording manual clearly states:
Quote:
For PCs, Soundcraft multichannel USB ASIO/WDM drivers are required (available for download on the Soundcraft website) and are used to adjust settings such as buffer depth and streaming mode.
MAC® computers do not require these drivers as the Signature MTK USB audio interface uses Apple® Core Audio drivers
+++ HERE +++ is a link to the model's webpage on the manufacturer's website.

The newest manufacture supplied USB driver is v3.20 released March 25, 2019. The installer includes both WDM and ASIO drivers.

Quote:
* USB Interface Compatibility:
PC: Supports Windows 7, Windows 8 and Windows 10.
Mac: Supports Mac OS 10.7.x Lion through 10.11.x El Capitan


USB outputs per the recording manual:
Quote:
USB Send and Return channels are numbered according to console channel ledgering, so Signature 12MTK’s input channels 1-12 for example are patched to USB audio channels 1-12. The 2-track (Master Left/Right) output uses the last 2 USB channels on each console and is always actively sending post fader level down the USB stream.


Lobster, the recording manual provides step-by-step set up instructions.


Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
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