GNMIDI

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Teleprompt synchronization
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A GNMIDI teleprompt is a multiline text where some lines use time stamps to optimize the scrolling speed during displaying.
All unsynchronized lines will automatically get calculated time stamps depending previous and next known time stamp and the amount of text between.
By default the first line gets time stamp 0:00 and duration of the presentation will be the time stamp of end. All time stamps lines between are calculated from the average speed between.

During playing the current play time is displayed and the current line with time between (calculated) time stamp of current line and before (calculated) time stamp of next line is colored red.
Calculated time stamps are displayed with gray text color other than time stamps that are set by user.
Similar to synchronization editor the dialog supports joined lines that are displayed above next line when the text line contains more spaces in series e.g. "The music ".
Such a line automatically gets the same time stamp as the next line. Lines that are joined are usually used for chords, presentation hints (spaces are used to align text above following line).

Play from begin
starts to play teleprompt presentation from beginning. The active line near the (calculated) time stamps are highlighted red.  
Background music is playing if the presentation is not silent and the background music file is available and valid MIDI or MP3.  
Windows volume slider in taskbar can be used to change volume.  

 Play before selection
starts to play teleprompt presentation few seconds before the current selected line.  

 Stop
stops the teleprompt presentation and optional background music.  

 Edit Time (manually changing a time stamp)
First select a line with mouse click into the list box. Use the button Edit time and enter a time that is between not calculated time stamps before and after this line.  
The gray calculated times can be ignored. The time format is minute:second or minute:second.millisecond .  
Delete the time in edit box to remove the time stamp for a line (makes it gray again with calculated time stamp)  
After pressing OK the valid time will be assigned as time stamp to the current selected line and joined lines too.  
The gray time stamps will be calculated and displayed again.  

 Synchronize selected line (change time stamps during playing)
while playing the presentation you can select a line with left mouse button and use the button synchronize selected line.  
The current play time will be assigned to this line if it is in valid range and also to joined lines.  
After successful changing the selected line changes to the next line.  

Created teleprompter text can be played with Play button and speed synchronized with the teleprompter synchronization dialog.