The product page description could use a little tweaking to specifically say that the device does not work with non-Outlaw processors. The way it reads it can be misconstrued that while it is specifically geared towards the 975 it isn't exclusive.

Transformative Engineering has introduced an HDMI switcher that allows older processors to integrate into a 4K/UHD system. Transformative and Outlaw paired up to release an Outlaw edition of the HDS-42AVR that works with the Model 975 only to allow four 4K/UHD inputs!
Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv

Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner