Mark Waldrep, aka Dr. AIX, has been producing and engineering music for over 40 years. He learned electronics as a teenager from his HAM radio father while learning to play the guitar. Mark received the first doctorate in music composition from UCLA in 1986 for a "binaural" electronic music composition. Other advanced degrees include an MS in computer science, an MFA/MA in music, BM in music and a BA in art. As an engineer and producer, Mark has worked on projects for the Rolling Stones, 311, Tool, KISS, Blink 182, Blues Traveler, Britney Spears, the San Francisco Symphony, The Dover Quartet, Willie Nelson, Paul Williams, The Allman Brothers, Bad Company and many more. Dr. Waldrep has been an innovator when it comes to multimedia and music. He created the first enhanced CDs in the 90s, the first DVD-Videos released in the U.S., the first web-connected DVD, the first DVD-Audio title, the first music Blu-ray disc and the first 3D Music Album. Additionally, he launched the first High Definition Music Download site in 2007 called iTrax.com. A frequency speaker at audio events, author of numerous articles, Dr. Waldrep is currently writing a book on the production and reproduction of high-end music called, "High-End Audio: A Practical Guide to Production and Playback". The book should be completed in the fall of 2013.

4 thoughts on “Studio Procedures 101

  • November 10, 2014 at 8:26 pm

    I fail to understand the value of mixing high resolution (per Mark’s definition) in “the analog domain” OR I fail to understand what is possible for high resolution in “the analog” domain.

    I do not accept assumption that “analog electronics” cannot process frequencies in the 20-40+ kHz range but the noise, loss, and other fragility seems almost insurmountable. This is where I don’t understand the value of all the conversion to mix in the “analog domain”. It seems like one needs the audio equivalent of a very expensive “clean room” to preserve the high definition attributes during mixing.

    Converting more than twice seems unwise. Convert to digital as close to the source as possible once and only once. Convert to analog as close to the destination once and only once.

    Has analog technology radically change and is no longer susceptible to the affects of physical environment variations, interference, etc that introduce noise and signal degradation? If yes (which I doubt) then let’s eliminate digital audio (and video). What?? We now have quantum interconnects? ;-}

    • November 11, 2014 at 9:56 am

      Wayne, engineers and producers choose to mix in the analog domain because of the tools that are uniquely available, the “sound” of analog, and the physicality of turning knobs and flipping switches to achieve a particular sound. Analog circuitry can easily pass ultrasonic frequencies AND handle the dynamic range required to be called high-resolution. And, as I’ve pointed out some engineers and producers are forced to work in the analog domain because there are any tools to work in their preferred format…i.e. DSD.

      Individual choices are made by producers and engineers per their own requirements.

  • November 11, 2014 at 3:54 am

    While I could confirm, that when using text book linear phase alias and anti alias filters for PCM, that I got a different soundstage (mostly depth) with PCM when comparing with the analog signal coming in or with DSD. But when I use minimum phase filters for alias and anti alias filters and running with 88k2 24 Bit, then I got the same (or very similar) soundstage with PCM as with DSD as with the analog input signal (but better focus and detail with PCM, but maybe a more smooth and forgiven treble with DSD). But I prefer PCM (when done with minimum phase filters) and preferring digital mixing (instead of analog mixing). So when comparing PCM, we have to always putting the time behavior of the digital filters into account, otherwise there is no “typical” PCM sound. With changing the behavior of the digital filter I can change the tonal characteristic of the DA and AD converter totally, from flat without depth to “analog”, as it was at the input side.

    • November 11, 2014 at 10:03 am

      Thanks for the input…I’m with you.


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