Apple Logic Express 7.2 - Manual (Page 42)

42 Chapter
1
Control
Surface
Setup
If
the
message
does
not
contain
Lo7
or
Hi7
placeholders,
an
incoming
value
of
1
is
assumed.
This
is
typical
for
pressed
or
released
buttons.
Also
see
the
“Multiply”
section
below.
Touch/Release
The
incoming
MIDI
message(s)
causes
a
change
in
the
touched/released
status
of
the
destination
parameter.
A
non
zero
value
means
touched;
a
value
of
0
means
released.
The
messages
are
displayed
and
entered
in
the
same
way
as
the
Value
Change
field
(see
the
“Value
Change”
section
above).
Note:
This
only
applies
to
the
Track
assignment
class
and
parameters
that
can
be
automated.
Min/Max
Defines
the
minimum
and
maximum
range
for
incoming
values
represented
by
Lo7
and
Hi7.
Typically,
the
full
range
of
0–127
is
used,
but
some
control
surfaces
may
use
the
same
message
with
different
value
ranges
for
different
controls
(CM
Labs
Motor
Mix,
for
example).
Format
Defines
the
way
negative
values
are
encoded
in
the
7-bit
portions
sent
over
MIDI.
You
can
choose
between
the
following
options:
Â
Unsigned—No
negative
values
are
possible.
The
full
7
or
14
bit
range
is
treated
as
a
positive
number.
This
results
in
a
value
range
of
0
to
127
or
0
to
16383.
 2's
complement—If
the
most
significant
bit
is
set,
the
value
is
negative.
To
obtain
the
absolute
value,
invert
all
bits
and
add
1.
This
results
in
a
value
range
of
–128
to
127
or
–8192
to
8191.
 1's
complement—If
the
most
significant
bit
is
set,
the
value
is
negative.
To
set
the
absolute
value,
invert
all
bits.
Note
that
this
allows
two
possible
encoding
values
for
zero.
This
results
in
a
value
range
of
–127
to
127
or
–8191
to
8191.
 Sign
Magnitude—If
the
most
significant
bit
is
set,
the
value
is
negative.
To
set
the
absolute
value,
clear
the
most
significant
bit.
Note
that
this
allows
two
possible
encoding
values
for
zero.
This
results
in
a
value
range
of
–127
to
127
or
–8191
to
8191.
The
appropriate
format
that
should
be
used
is
usually
documented
in
your
control
surface
user
manual.
If
unavailable,
check
the
control
surface
manufacturer’s
website,
or
contact
them
via
phone.
Multiply
Allows
the
incoming
value
to
be
scaled.
Especially
useful
for
button
presses
that
have
a
value
of
1.
Examples:
to
set
the
automation
mode
to
Write,
set
Multiply
to
4.00
and
Mode
to
Direct.
To
decrement
a
parameter
by
1
with
a
button
press,
set
Multiply
to
− 1.00
and
Mode
to
Relative.
The
1
and
–1
menu
items
in
the
combo
box’s
menu
conveniently
enter
the
most
commonly
used
values
of
1
and
–1