Numark HDX Guide D'utilisation page 20

Interlock
Interlock allows you to automatically synchronize the tempo of music playing on two HDX. You will need two
standard MIDI cables. Connect the MIDI OUT from the first HDX to the MIDI IN of the second. Connect the
MIDI IN of the first HDX to the MIDI OUT of the second HDX.
1. Turn on both HDX units.
2. Start one of the HDX playing. This will initially be the Master.
3. Start the other HDX playing. This will initially be the Slave.
4. On each HDX make sure the Beatkeeper™ is properly synced with the music. Use the Tap button if
necessary.
5. On either HDX, you can toggle Interlock mode on and off by pressing the MENU button, selecting
PLAYBACK OPTIONS, then INTERLOCK.
6. The slave HDX will sync its tempo to the Beatkeeper™ of the master by automatically shifting its
playback speed.
7. Both HDX will flash their status ("Master" or "Slave") at the bottom of the display to indicate their
current role.
8. As you make adjustments to the master unit's pitch, the slave unit will follow and attempt to
match. Adjustments you make to the Slave's pitch slider will have no effect. The Slave's platter
also will not affect playback, since playback speed is now controlled by the Master.
9. When you pause playback on the master while both units are playing, the master and slave will
exchange roles.
10. If the position of the pitch slider on the new Master does not match the pitch it had been playing
at, the screen will flash "Increase Pitch" or "Decrease Pitch" instead of "Master". This means you
must move the pitch slider through the point corresponding to the pitch at which the HDX is
currently playing before you will be able to use the pitch slider to adjust the pitch. The pitch
display will show the direction and amount of adjustment needed to return the slider to the
appropriate position. This is to prevent abrupt changes in pitch when you move the slider.
11. On the Master HDX, the Beatkeeper will show the beat of the slave as a flashing LED if the two
HDX are not in sync. If the two HDX are in sync, the Beatkeeper LED will march normally with the
beat.
Tips:
• If you select a new track using the track select knob, Interlock will be turned off on the HDX you
selected the new track on. If that HDX was the Master, the other HDX will become the Master.
• If you press the Tap button once to correct the downbeat, Interlock will remain on. However, if you
press the Tap button multiple times or hold the Tap button to correct the beat, Interlock will turn off
on that HDX.
• As a result of the previous two notes, it is possible to end up with one HDX in Interlock mode while
the other is not. If you use the "Single" and "Menu" key combination described above you must do it
on the HDX that is not in Interlock mode. If you use the menu to turn Interlock on, it does not matter
which HDX you do this on but you must press Select once you've turned on Interlock, even if "ON" is
already displayed in the Interlock menu.
• The pitch slider, 33/45 button, Reverse and Bleep do not work on a HDX when it is in Slave mode.
• Moving the platter on a HDX that is in Slave mode has no effect.
• You can not enable Interlock if either HDX Beatkeeper has not yet synced.
• Brake time should work properly at all times but Start time will not work on a HDX that is in Slave
mode. If the HDX is in a mode where the playback is not controlled by the pitch slider then there may
be a noticeable jump in pitch when Pause is pressed. This is more noticeable for longer brake times.
• When Interlock is turned on, Key Lock will automatically be enabled. You can turn Key Lock off
normally.
• When Interlock is turned on, Smart Loop will automatically be enabled. You cannot turn Smart Loop
off while Interlock is on, because it would then be impossible to sync the music.
• If the two HDX are out of sync by a constant amount for an extended period of time, reset the
Beatkeeper by pressing the tap button once on the downbeat of the music
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