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Great tool, but a GUI would greatly enhance usability, along with a file selection window to apply desired function to several selected files. Thanks!
SoX is not going to get a GUI, but there are many existing sound editors which could use SoX as a plugin. The most obvious to which to add SoX support would be audacity.
Although I have not tested it, please note the existence of QSox .
Quote from their official announcement:
"The CICM, a musical research center in Paris, is happy to announce you that we are currently developping a frontend for SoX : QSox. It is a batch-oriented frontend for SoX with Qt."