The RTTY program, version 2.0 is not a complete ``closed box'' solution with all the features you think are needed for an easy reception. Instead, the program has been designed with an academic purpose in mind, and allows people to look what's happening inside during reception.
This program is only suited for asynchronous communications. Other data formats, like AMTOR, PACTOR, Weather data, etc. are not supported. In fact the program is able to recover those bit-streams, but i don't know very much about those data formats.
The program gives you a graphical interface that shows several signal traces in a window that resembles an oscilloscope screen. This window helps to tune the incoming signals and also to identify some of its characteristics.