To recreate the meters we had to learn a new programming paradigm from scratch: Apple's "Metal" graphics renderer, used mainly for game animation graphics programming and rendering. API deprecated by Apple as of MacOS Big Sur. Quartz Composer patch diagram for original Pure Music / Pure Vinyl metering interface. This core UI code was originally created in 2008, thoroughly tested and debugged, and re-used successfully with only minor modifications since then. Besides what's visible here, there is additional underlying complexity in the patch's subroutines, which are colored blue in the image (and which also have their own underlying patch subroutines). Shown in the image below is the "patch" diagram that controls the metering logic. We used Quartz Composer to create the visual portions of the metering in Pure Vinyl and Pure Music. Apple is no longer supplying Quartz Composer with the XCode software development package. One of the sticking points, now nearly completely addressed, was Apple's unexpectedly sidelining their graphically-oriented Quartz Composer development tool, along with the underlying OpenGL graphics environment, in the Big Sur OS. Mural on wall is an iPhone panorama photo of rainbow taken from Point Lobos State Reserve facing Monterey, California - inspiring because our Apple Silicon Macs are running Monterey OS, also!Īpple Mac Studio M1 Ultra computer driving three 4k monitors, one of our workstations used for software development. Here is a marriage with 32-year-old technology: the Apple Extended Keyboard II from 1990, with its silky Alps Electric switches is regarded as one of the best designed computer keyboards ever produced (a difficult to find ADB adapter is needed to connect to the computer USB port, however). One of those is Apple's newest 20-Core CPU Apple Mac Studio M1 Ultra computer, driving three 4k monitors, shown in photo below of one of our development workstations. We currently have four Apple Silicon computers in house for development. We're still working hard on the updates to Pure Music and Pure Vinyl. This daughterboard attaches to and is mounted directly under the input circuitry PCB. Seta Model L 2022 Edition "overkill" Latching Relay Array, needed for highest quality Transimpedance / Voltage Mode switching. RIAA / signal processing daughterboard not attached. Seta L 2022 Edition Front End and Power Supply PCB with input circuitry in machined copper block. Also included are new front-panel and Remote-Control-operable switches for absolute polarity, stereo/mono output, and 16 Hz subsonic filter. Now included is the ability to instantly switch between standard, voltage-mode and Transimpedance mode on the fly. We're now shipping the updated version of our very-highly-reviewed (Stereophile's former Editor John Atkinson even purchased his 2012 model review unit) Stereophile "Class A" and The Absolute Sound Editors' Choice, 5-megahertz-bandwidth, ultra low distortion Seta L phono stage. Seta L 2022 Edition with switchable Voltage/Transimpedance Mode, Polarity Invert, Subsonic Filter, Stereo/Mono. Lino C 3.3 with optional black powder coat finish. We are over the moon thrilled by this! A big thank you to Stereophile. Class A+ : Lino C 3.3 placed in Stereophile's Recommended Components "A+" Category!īig news for us in the October 2022 "RC" issue of Stereophile: the Channel D Lino C 3.3 has now become one of only three phono stages recommended by Stereophile to be placed into their exclusive "Class A+" Category of Recommended Components!Īlso honored as "Class A" phono stages (formerly the highest category before Class A+ was added as a category) are the Lino C 2.0 and Seta L (2012 production version).
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