The main aim of this paper is to describe a new software program for esophageal speech treatment developed at the University of Deusto. The software tool, named “ESOIMPROVE”, allows both to characterize and to modify this speech, and provides the necessary framework to achieve a high quality and intelligible transformed esophageal speech by applying a complete range of sound effects and algorithms. In this field, this tool represents a considerable advance in the study of these voices. The final objective of the project is to obtain an esophageal speech with acceptable levels of quality and intelligibility, and some more works in this direction are being actually developed.