readme, update ui to bulk upload racks with single files and empty.tx…

…t, bump version to 3.7.0

README.md

@@ -157,7 +157,7 @@ The term "rack" is our word for multi-sample functionality. With a traditional m
 You can use **shift-click** and **command-click** to select regions of notes (and regions of racks), or ctrl+a to select all notes. If you click **select files** while a range is selected, then the file dialog that comes up will allow you to select multiple files. The files you select will be sorted alphanumerically, and placed in order into the notes you have selected.
 
 # bulk uploading racks 
-If you **shift-click** on **select files** while a region of notes are selected, a special file upload dialog will appear, which allows you to select a **directory**. This function allows you to bulk upload some racks. The structure of the folder that you select must be organized in a very specific way. It must be a folder of sub-folders. Each subfolder represents a rack, and contains all the files for that rack. It will use the name of the subfolder for the name of the rack, and it will create as many slots as there are files. It will then sort all the folders, and all the files in all the folders alphanumerically, and place them into racks in the notes that you have selected.
+If you **shift-click** on **select files** while a region of notes are selected, a special file upload dialog will appear, which allows you to select a **directory**. This function allows you to bulk upload some racks. The structure of the folder that you select must be organized in a very specific way. It must be a folder of sub-folders. Each subfolder represents a rack, and contains all the files for that rack. It will use the name of the subfolder for the name of the rack, and it will create as many slots as there are files. It will then sort all the folders, and all the files in all the folders alphanumerically, and place them into racks in the notes that you have selected. If any of these directories contain only one file, then a rack will not be created, it will load as a normal single sample, and if the directory contains only a single file called empty.txt, then this note will remain empty.
 
 # save and load voice configuration
 If you **shift-click** on a voice button (numbered 1-16 at the top on the home screen) a dialog will open that will let you download a .json file, this file represents all the config settings for that voice. You can rename it as you like with the .json suffix, and save it to your computer. If you **shift-alt-click** on the voice button, a dialog will open, where you can select a previously saved .json file to now load up all those config settings into that voice.

src/wvr_0.3.h

@@ -1,7 +1,7 @@
 #ifndef WVR_0_3_H
 #define WVR_0_3_H
 
-#define VERSION_CODE "3.6.0"
+#define VERSION_CODE "3.7.0"
 
 void wvr_init(bool useFTDI, bool useUsbMidi, bool checkRecoveryModePin);