Moog Music Minimoog Voyager XL (User’s Manual Addendum) - Manual (Page 3)

Minimoog Voyager XL User’s Manual Addendum
Understanding the LFO2 Module and MIDI Implementation
Specifications subject to change without notice
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MIDI SYNC
MIDI SYNC (or RTC CLOCK) is channel independent. When the LFO2 module detects the start of a MIDI
RTC CLOCK stream, it starts measuring the time interval between clocks. All other RATE determinates
are overridden and the LFO2 automatically synchronizes to the CLOCK. At this point, the SYNC LED will
illuminate a solid AMBER color.
While in MIDI SYNC, the CLOCK_DIVISOR is determined by three controls:
• MIDI CC94: MASTER CLOCK DIVISOR (refer to the manual pg. 79 for more information
on this CC)
• FRONT PANEL RATE KNOB
• EXT. RATE CV INPUT
Turning the front panel RATE knob on the LFO2 module during MIDI SYNC adjusts the clock divider
going from 4 WHOLE NOTES (all the way CCW) to 1/64
th NOTES (all the way CW). This covers the
same range as the MIDI CC94.
You can also adjust the clock divisor by using an external control voltage in the RATE CV jack on the
front of the LFO2 module. Again, the RATE CV and the front panel RATE knob are additive. The final
clock divisor is determined by the sum of these two voltages. Note, however, that the sum is capped at
“5V”, or the fastest clock-divisor of 1/64
th notes.
Using the RATE CV is a fun way to play the LFO RATE while in MIDI SYNC mode. For example, you
could take the RIBBON CV output and plug it into the RATE CV input. Now you can manipulate the
LFO2 rate using the ribbon controller, but the rate will always be sync’d and a multiple of the MIDI
CLOCK making for some very interesting rhythmic variations.
(Remember: the RATE CV input on the LFO2 module is a 0V to 5V input. To use a
bipolar CV output like the Ribbon CV, you must first modify the ribbon CV to be
unipolar. You can easily do this by using the ATTENUATOR CH.2 output and adjusting
the AMNT and OFFSET to scale -5V to +5V to 0V to 5V or any other scale you want.)
Sending a MIDI CC94 to the LFO2 module will override the last active RATE CV-determined clock divisor.
MIDI SYNC ENABLE
The Voyager XL always powers-up with LFO2 MIDI SYNC enabled, meaning that LFO2 will always
default to MIDI SYNC mode any time MIDI CLOCK messages are received. MIDI CC 111 allows you to
control this behavior: MIDI CC 111, value 0-63 disables MIDI SYNC for LFO2. If MIDI SYNC is disabled,
the LFO2 module will ignore MIDI CLOCK and will run freely at its internal rate even when Clock
messages are present. MIDI CC 111, value 64-127 will enable MIDI SYNC again.
MIDI MASTER RATE
Sending a MIDI CC92 to the LFO2 module will set the MASTER RATE of the LFO2 outputs. This allows
you to manually set the LFO2 rate remotely. Standard MIDI CC resolution is 7-bits, values of 0-127 are
allowable to sweep from 0.02Hz to 20Hz.