Tascam X-48MKII Owner's Manual

36 TASCAM X-48MKIIVideo ClockVideo Clock gives a precise frame edge to the SMPTEtimecode. Not available as a clock reference.SMPTE TimecodeSMPTE Timecode is used as a location reference,defining where in the timeline to locate to.MIDI TimecodeMIDI Timecode (MTC) is sometimes used as a locationreference with MIDI sequencing software or computer-based DAW softwareRS-422In addition to receiving playback, record and othertransport commands, track record arming can also becontrolledAs these reference sources are all related, you can seethe importance of making sure that all of your devicesare resolved to the same clock reference. Another way tolook at sync on the X-48MKII is to examine the order thatthings happen when the X-48MKII is online:1. The X-48MKII either sees a transport command fromthe RS-422 signal or sees SMPTE timecode and goesinto play.2. The X-48MKII looks at either the SMPTE input or theRS-422 to determine where in the timeline tobegin playback.3. If enabled, the X-48MKII looks to the video clock inputfor a more exact timestamp for the incoming SMPTE.4. Once the X-48MKII is locked to the right SMPTE frame,it starts playing at the rate dictated by its sample clocksource.5. If the input SMPTE drops out or is otherwiseinterrupted, playback (or recording) will stop whilethe timecode is interrupted depending on the ChaseFreewheel setting. Moreover, if the input timecode andthe unit’s timecode drifts beyond the Relock Thresholdvalue, the input timecode will either be rechased orthe drift will be ignored and playback will continuedepending on the Chase Relock setting.6. When SMPTE timecode stops or an RS-422 stopcommand is received, the transport stops.Sample RateA sample rate should be chosen when first creating aproject, with consideration to what will be done with thefinal product. Your choices are:44100 (CD standard)•48000 (DVD standard)•88200 (2x CD standard)•96000 (2x DVD standard)•42336 (44.1k conversion from film (24) to PAL (25))•44056 (44.1k pull-down)•44144 (44.1k pull-up)•45938 (44.1k conversion from PAL (25) to film (24))•46080 (48k conversion from film (24) to PAL (25))•47952 (48k pull-down)•48048 (48k pull-up)•50000 (48k conversion from PAL (25) to film (24))•84672 (2x 44.1k conversion from film (24) to PAL (25))•88112 (2x 44.1k pull-down)•88288 (2x 44.1k pull-up)•91875 (2x 44.1k conversion from PAL (25) to film (24))•92160 (2x 48k conversion from film (24) to PAL (25))•95904 (2x 48k pull-down)•96096 (2x 48k pull-up)•100000 (2x 48k conversion from PAL (25) to film (24))•If you change the sample rate after audio has beenrecorded, that audio will play back at a different pitch. Tochange the sample rate:Mouse/Keyboard Operation1 Click the Windows menu and select the Settingswindow.2 Click the Sync tab and set the sampling frequencyusing the Rate item in the Sample Clock section.Front Panel Operation1 Press the SYNC button. Press the 5/b buttons toselect Sample Rate and press CHNG.2 Select a sample rate from the list using the 5/bbuttons and press Enter.3 When Changing Sample Rate OK? appears,press the ENTER/YES button.Clock SourceOne of the most important settings on the X-48MKII is thesample clock source, which governs playback speed andkeeps audio pops from happening. There are five choices.InternalInternal is the default. This can be used if the X-48MKIIis either used by itself, with an analog console or as themaster clock for the studio.Word ClockWord Clock should be used when you have an external,dedicated master clock available. The word clockgenerator needs to be set to the same sample rate as theX-48MKII.S/PDIFS/PDIF clocks the X-48MKII from the digital audio signalcoming into the S/PDIF Digital Input.5 – Recorder