Help setting up Focusrite Clarett 4Pre USB in Focusrite Control for REW with loopback

jhaider

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Jul 8, 2017
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My AV System  
Preamp, Processor or Receiver
Monoprice Monolith HTP-1
Main Amp
Crown DCI 8|600n (LCR + heights)
Additional Amp
Crown DCI 4|600n (sides/rears)
Other Amp
Crown DCI 4|1250n (subs)
Universal / Blu-ray / CD Player
Sony 1100ES
Front Speakers
JBL LSR708i
Center Channel Speaker
JBL LSR708i
Front Wide Speakers
none
Surround Speakers
JBL CBT-50LA
Surround Back Speakers
JBL CBT-100LA
Front Height Speakers
Pioneer EX S-ic891
Rear Height Speakers
Pioneer EX S-ic691
Subwoofers
bespoke; Aurasound drivers (18, 2x15, 2x12DO)
Video Display Device
LG 55" OLED
Remote Control
Harmony Ultimate
Streaming Equipment
AppleTV 4K (current); Mac mini M1, Roku Ultra
Streaming Subscriptions
Apple Music, some video ones
Other Equipment
2ch system with B&O Beogram RX-2 tt with SoundSmith SMMC3 cartridge and Parks Audio Puffin phono pre, Apple AirPort Express, miniDSP SHD Studio and 10x10HD, NHT XdS sats, Velodyne SC10 flanking subs, ULF subs Aurasound NS15-992-4A in ~40L closed box and Tymphany LAT-700 in 35L closed box
I recently picked up a Focusrite Clarett 4Pre USB because I thought I might buy REW Pro and make simultaneous measurements to save time. However, I've been messing with the Focusrite Control software and simply cannot make heads or tails of how to set up the interface for use with REW and a loopback. (I believe, though I didn't know this until after I bought ti, this model does not support software loopbacks.) My previous one, a Scarlett 2i2, had a simple hardware interface.

Does anyone have screenshots from Focusrite Control to illustrate how to set this box up to inject the measurement sweep into the DAC or amp from digital coax or analog respectively, and also set it up to accept a wired loopback?
 
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