Scale, Screen offset, Scroll position – ChamSys MagicHD User Manual
Page 61: Scroll speed, Speed factor, 19 scale, 20 screen offset, 21 scroll position, 22 scroll speed, 23 speed factor

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Value
Action
Notes
0
Once
Play clip once, hold last frame
(hold first frame if playing backwards).
1
Once-then-black
Play clip once, then go to black
2
Loop
Loop in the current direction of play
3
Bounce
Reverse direction at first/last frame.
4
First frame
Show start frame
(1)
.
5
Last frame
Show the end frame
(1)
.
6
Pause
Show the current frame, regardless of speed.
7
Next frame
Advance to the next frame then
automatically pause
(2)
.
(1) Note that these modes ignore playback speed and always show the selected frame. If the start or end frames are changed, the
displayed frame will change. This allows the user to view the start and end points as they are moved around within a clip.
(2) Play mode must go back to Pause before this mode can be used again.
10.5.19
Scale
Pseudo-logarithmic scale factor with the values 0 to 65535 corresponding to a multiplication factor of 0.0 to 10.0, with 32768
being 1.0.
10.5.20
Screen Offset
Linear scale, with the values 0 to 65535 corresponding to an offset in screen position of -1.0 to +1.0. 32768 corresponds to 0,
i.e. no offset. A value of 0 in the X position of a layer, for example, would move the layer one screen width to the left (-1),
effectively taking it just out of view (if its width was unchanged).
10.5.21
Scroll Position
Linear scale, with the values 0 to 65535 corresponding to a scroll position of -100.0 to + 555.0. When scrolling in X the position
is in characters. When scrolling in Y the position is in lines. (0,0) is the top left of the first character in a piece of text.
10.5.22
Scroll Speed
When used to scroll the content of a layer, the speed is in units of width or height. In other words, a speed of 1.0 will scroll the
entire width (or height) in 1 second.
Value
Speed
Notes
0
0
Reset to start position
1-127
1.0 - 0.008
Negative (Left, Down)
128
0
Stop
129-255
0.008 - 1.0
Positive (Right, Up)
10.5.23
Speed Factor
Speed is represented as a multiplier to be applied to the normal speed, with the values 0-65535 encoded linearly as follows:
Value
Speed Multiplier
Notes
0
-500%
Backwards at 5 times normal speed
26214
-100%
Backwards
32768
0
Stop