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.

14 thoughts on “Preview: The iTrax-Sprint Ultra HD-Audio Sampler

  • Blaine J. Marsh

    No surround?

    • This is a collaboration with Sprint and their device is not surround capable. I may offer them in the future.

      • Dave Griffin

        Are these two channel mixedowns, or have they been re- mastered for stereo?

        I’ll buy anyway, but it can be distracting to have instrumets in wierd locations in the two channel mix, especially when listening through headphones, ie drums hard right, as opposed to central to the sound stage.

        • Every mix that we offer in stereo is a discrete mix from the multichannel masters. They are not foldowns of the multichannel mixes. However, they are derivative of the multichannel mixes. A set of drums is on the right side of the “stage” mix…and on the front right side in the “audience” mix and leaning to the left half of the stereo mix…I do this to be consistent. There’s no rule that says a drum set needs to be spread across the middle of a stereo mix.

          • Dave Griffin

            I’ve yet to go to a small gig where the drum kit wasn’t behind the rest of the musicians, and I’ve yet to hear any jazz, rock or pop recording (apart from Motown) where the drums are not centre stage; I think for a stereo mix, particularly headphones, there shouldn’t be a loud instrument hard left or right, I find it distracts from the performance.

          • Dave, recording are not necessarily models of a live concert…in fact, very rarely so. The Allman Brothers, Toto and others have drums off to the side(s). And in reality, all of the sound is being mixed and redirected out a central column of speakers in mono anyways.

            The instruments need to be balanced…I place the grand piano on the left half of the mix to equal the drums on the other side. I think you’ll be surprised that they is so much more room in the middle of the mix if the lead vocal, kick drum, snare, bass etc are all vying for the same location.

          • Dave Griffin

            I find your instrumental separation, after mix down to stereo, very skewed (from your previous BD sampler) and the implication of what you say about the musicians vying for place in the centre suggests the space they occupy is planar rather than having depth; I don’t believe that.

          • Dave…these are the same mixes as on the BD sampler. I only create the stereo mixes once and whether they are downloaded or put on a disc, they remain the same. On the issue of most recordings having depth, there’s an entire article there. In fact, I believe that I’ve addressed in a previous post. If the recording engineer uses stereo miking technique then you can create a sense of depth. But most commercial recordings don’t use stereo mikes on the drums and instrument and thus can only pan from speaker to speaker…a planar space. It’s a matter of taste whether you want things in the middle or spread out…I prefer to have some room in my stereo mixes. I find stereo very limited.

          • Dave Griffin

            To be fair, the new sampler is actually very good – even though the higher sampling frequency is giving VLC a bit of a hard time (yes I’me listening using my Note 3, FIIO X3 Ray Samuals, Sennheiser Headphone combination, even though I’ve returned from my holidays..) and the stereo mixes (on this equipment) sound quite acceptable. However, those surround mixes, when translated to stereo makes tracks such as that by Carl Verheyen sound as if they might have been recorded in the 60’s – not necessarily a bad thing.

          • I’m surprised that you having difficulties with the FLAC files in VLC. You can always convert them to WAV/PCM…that might make a difference. Thanks for the positive comments. The Carl Verheyen track is on the sampler because of the incredible sound of the guitar and especially the drums. Even my wife commented on the incredible presence of the drums. As a wanna be guitar player, Carl’s tone and playing are amazing.

          • Dave Griffin

            I’m not using FLAC I’m using WAV and downloaded in WAV also. I like the way VLC can key into the ‘phones hardware in a way that (I assume) the built-in Android player doesn’t. However VLC is still in beta on Android and there are some bugs to iron out. Nontheless, VLC sounds markedly superior (even with the bugs) to the built in player irrespective of sampling frequency.

            I agree with the sound of the guitar on the Carl Verheyen track, the feel and the mixdown from surround of the track reminds me a little of Fairport Convention.

    • Phil Olenick

      Blaine beat me to it! I’m a stage-perspective guy as you know – an iTrax sampler from stage-perspective would be a delight.

      PS My recent posts about networking music is why I buy the iTrax downloads, rather than the physical disks.

      However, why not extend Amazon’s model of letting customers who buy CDs from them stream those CDs on line?

      You could give people who buy your DVD-As and Blu-rays a code enabling them to download the music mixes on the disk so they could load them into their network servers.

      it would make buying your disks very appealing.

      • Gentleman, you all know that I’m a surround guy like you. But this is a special collaboration with Sprint and I’m thrilled to have gotten involved with them. I will get something going that ties in the physical discs and a discount code for the downloads…hang in there.


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