Expression 3 - ETC

External time code clock
When running a real time program with an external clock, the event list
pointer jumps to agree with the frame of the external clock. Sometimes
the timing signal is not yet present even though the external clock is
enabled, causing a delay in the execution of the program. When that
happens, you will see a Waiting for input message at the upper left
corner of the Time Code Events display. When the external signal begins,
the message disappears and the TimeCd value begins to run. 16
You can lose events on the first pass through the program if the external
signal starts before the program is ready. 17 That happens because the
event list pointer moves with the external signal and has already passed
the code time of one or more events. These missed events, however, will
be played in subsequent passes through the program.
Enable an external clock with the procedure below. Note that the
procedure also enables the console’s internal clock, which can then
provide backup if the external clock signal fails. The order in which these
two clocks is enabled is important. Also note that it takes at least five
seconds for the external and internal clocks to come into synchronization,
so any events during that initial synchronization period could be missed.
Keystrokes:
Actions:
1. Press [Setup]. Selects Setup display
2. Press [6], Options
Settings, and press
[Enter].
3. Press [5], Time Code
Input, [Enter].
Selects Options Settings menu
Prompt reads:
Enable/disable external time code
input
0=Disable, 1 = Enable SMPTE,
2 = Enable MIDI Time Code (MTC)
4. Press [2] [Enter]. Enables the external MIDI time code
clock
5. Press [S8], Return. Returns to the Setup display
6. Press [1][3] [Enter]. Selects the Time Code Events option
7. Press [S2], Enable Clock. Enables the internal time code clock
16.
You can verify which clock is running the program by the color of the
Timecd number in the upper left corner. A red number means the
internal clock is running the program; a green number means that the
external clock is running the program.
17.
Losing events on the first pass can also happen if you edit a program
that is running at the same time. To avoid that, see Re-setting the
event list pointer, page 301.
Expression 3 User Manual, v.3.1 309