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The principles of using GNMIDI
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GNMIDI consist of many operations. Some can be applied any time and most others must be applied to an open MIDI document.
The operations can be found in the menus and some important have icons on a toolbar. The menu or toolbar item is grayed if the operation is currently not available. Use File Open operation to load a MIDI file.

Document windows
Most GNMIDI operations don't modify your original files. Every time when you apply an operation to a MIDI file document then a new temporary file will be created in a temporary folder and opened in a new window. It is necessary to save the file after testing the result (by playing the file). Click on a window caption to activate the document, the window will get into front. You can close unnecessary windows of unused intermediate results when a work is done.  

Drag and Drop
GNMIDI can open MIDI files by drag and drop method. Open Windows Explorer and GNMIDI and select MIDI files in Windows Explorer and drag them with pressed left mouse button into the GNMIDI application and drop them (release left mouse button).  
The menu at top of application offers to start available commands. Use the underlined menu shortcut keys for quicker use of a command.  

Many operations require parameters that will be offered in a dialog and they must be entered so that GNMIDI will do exactly what you want. When a dialog appears you should look at the current parameter settings and modify them if necessary. Use the mouse buttons to click on the dialog controls and use keyboard to enter text into edit boxes. At end you can accept the parameters and start the operation with OK button or you can abort the dialog and operation with Cancel button.  

Tool bars
Toolbars contain many symbols that can be clicked with left mouse button. Move the mouse over a symbol to display a tool tip that tells what it does and show a description in status bar. Toolbars can be moved to other positions.  

Status bar
Status bar shows important messages on the left side and tells your name if you are using the registered software.  

Hot keys
Some important operations can be started with a key combination. The menu entry shows the key code near the operation name. For key combinations you need to press more keys at same time (usually Alt or Ctrl or Shift key together with a letter key).  
F1      Help  
Space   Play or stop playing  
Ctrl-Space   Play with standard MIDI player  
Ctrl-A   Start entertainment player  
Ctrl-I      Player status information  
Ctrl-K   Karaoke editor  
Ctrl-Z      Synchronizing editor  
Ctrl-R   MIDI Recorder  
Alt-X      Sysex transfer  
Ctrl-O   Open MIDI file  
Ctrl+Shift+S   Save MIDI file to original file (with backup created)  
Ctrl-S   Save MIDI file to a new file  
Ctrl-E      Edit text  
Alt-F4   Exit  
Ctrl-F4   Close MIDI file  
Hint: Ctrl key might be Strg key on your keyboard

Batch conversion
Some important operations can be applied to a folder full of MIDI files. The operations are listed in File menu under Batch conversion. The results are stored in a destination folder using same file names.  
Using GNMIDI Light license batch operations are not available.  

Backup original MIDI files
Many operations are not reversible. Keep backup of original MIDI files before you are overwriting your original files!