Set Flywheel Duration; Park Ahead - Alesis ADAT-M20 Owner's Manual

11.6 S
B ET
There are two chase modes: Frame-Lock (default) and Lock/Release (i.e., Lock and Release
to clock). Chase must be enabled.
The Down Arrow button or keypad button 0 selects Frame-Lock. With Frame-Lock mode,
the M20 will relocate to incoming time code if it does not match the current tape location.
The Up Arrow button or any keypad button greater than 0 selects Lock/Release. In
Lock/Release, the M20 references the incoming time code location to establish a lock. Once
locked, it ignores the time code data and follows the selected external clock source to
maintain lock.
Definition of Lock/Release mode: In Lock/Release, if the incoming time code stops for
more than the flywheel amount (section 11.6c), is running but not advancing its
frame numbers, starts counting frames backwards, or begins to advance at a non-
play speed, the M20 will stop playing and attempt to chase to the time code location.
If the time code is advancing forward but has a discontinuity, the M20 will continue
to play without attempting to chase to the new time code location. Lock and release
mode is a more "forgiving" mode in difficult time code applications where the
master code has dropouts or jumps from one type to another.
11.6 S
C ET
This parameter selects the maximum number of invalid or missing time code frames that will
be ignored (up to 150 maximum). In Frame-Lock chase mode, the M20 keeps playing for the
flywheel time as if valid time code was present, then chases when valid time code data
reappears. In Lock/Release chase mode, flywheel sets the amount of time that the M20 will
continue to play in the absence of incoming time code before stopping the tape.
Use the Up/Down buttons, or enter a 3-digit number with the keypad (leading zeroes must
be entered).
11.6 P
D ARK
The M20 can park tape ahead of the last valid time code input, up to 59:29 (seconds/frames).
Default is 00:00 (tape does not park ahead). The Park Ahead parameter is available to make
lockup times shorter in situations where the master time code source drops out or drifts for a
few seconds as it stops and starts (for example, when a VTR disengages).
Operation
Select field to edit
Change numeric field
value
Exit Park Ahead setup
A M20 R
LESIS EFERENCE
SMPTE C
HASE
F D
LYWHEEL URATION
A (P
HEAD AGE
You press...
Left/Right Arrow
buttons to scroll to
desired field
Enter two-digit number
from keypad (leading
zeroes must be entered)
or use Up/Down buttons
Edit button or any other
Edit Group button
M 1.06
ANUAL
Chapter 11, SMPTE, Sync and Offset
M (P 2)
ODE AGE
(P 3)
AGE
4)
You see...
Cursor under selected
field
Your entry replaces
current field value
Display leaves Park
Ahead function
11-5