High-end audio interfaces. OBJECTIVE TEST RESULTS. Snake oil???

About

I'm a professional mastering engineer. I'm on YouTube to make entertaining videos while creating brand awareness for my no-nonsense, great value, online courses on audio related topics and VST plugins. I studied audio engineering in 2005 (BA hons 1st). Since then I've been a recording and mixing engineer, I've constructed studios, manufactured acoustic treatment, offered acoustic consultancy, built analogue compressors, EQs and amplifiers, fixed vintage guitar amps, soldered thousands of TT connections, made guitar FX pedals, released several albums, played gigs on drums, bass and guitar, taught at university and most recently started offering online courses and developing VST plugins. Despite the variety, my core specialization has always been mastering and I am most active within the techno scene. See my website for more info on what I'm currently working on: https://apmastering.com