Using MP3Tag Tools, it is possible to run an external application, and to pass several parameters to the external application. Currently, these parameters are generally limited to fixed text, a single file name, or a filepath. More complex operations require use of the exporting capability to create batch files that run or used as input to the external application.
This request relates to the ability to pass a list, e.g. all the file names that are currently selected, to the external application. For example, MP3GAIN can be invoked using a command line as follows:
Mp3gain.exe /s I track1.mp3 track2.mp3 track3.mp3 track4.mp3
This command enables mp3gain to analyze the volumes of the listed tracks, understanding that the list represents an album whose tracks should be adjusted together.
Implementing this feature could also help to alleviate the problem where mp3gain, or any external application, is invoked once for each file selected, thereby running many instances of the external application simultaneously.