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If, in the starting folder, you place a shortcut towards another folder, the latter will be explored and its musical files will be selected. You should use and familiarize yourself a little with Windows Explorer in order to carry out this operation (see below).
This has two main advantages :
You can make a selection of only a part of your folders. Create a folder of "favorites" containing only shortcuts to existing folders of your favorite musicians and make it your starting folder. This you will restrict the random selection while keeping your main folder intact.
Your MP3 files could be spread on several disks and even several computers if you have a network. Create an empty folder on your computer and put in shortcuts towards other locations, then make it your starting folder.
Only folders in the starting folder will be processed, to avoid recursion.
Shortcuts to MP3 files are also accepted, anywhere. They allow you to avoid duplicating pieces and to have several arrangement. Thus, you can prepare a selection for an evening, for example.
To create shortcuts, use Windows Explorer and drag the icon of a folder (the target) while pressing down the right hand button of the mouse, over to the starting folder, where you will release the button and click on "Create a shortcut or shortcuts here".
All the folder containing MP3 files are considered terminal, regardless of their place and depth in the tree diagram. Each of them can be choosen only once, until they have all been played once, or skipped over by means of manual intervention.
Within a folder, the pieces are sorted in alphanumeric order. If they are to be played in a defined order, you have to name the MP3 files starting with the number of the piece. Most encoders do this by default. E.G: the piano sonate #1 from Rossini should be : 01_moderato, 02_andantino, 03_allegro and without prefixes it will be played in reverse order !
If you don't want the pieces to be played in an unchanging order, all you have to do is divide it up into sub-folders.
By clicking with the right hand button of the mouse on a piece or a folder, you can choose different actions in a menu.
First, it is always possible to pause or access preferences, same as clicking on the buttons below.
The other options assume that you are checking off a piece or folder :
You can remove a folder or a piece in so that you won't hear it. It will not be deleted from the disk and will reappear in future selections. If it is currently being played, the next piece will begin. If you delete the starting folder, a new selection will be made. The "Delete" key removes the selected piece or folder.
Another possibility would be to delete the piece or the folder permanently. Be careful: this will MP3 files rather than put them in the wastebasket, so they will be unrecoverable.
It is useful to name or rename the pieces.
Of course, you can perform these last two options, and a bit more, with Windows Explorer.