Grahic User Interface (GUI) Tools
The command line is for simple text output: see the CLI menu. An Interactive Development Environment provides an adequate tools for development and debugging: see the IDE menu. However, there are occasions when a GIU affords better operation of a data sonification and these tools are for those.

Event driven GUI vs Interpreter+CLI
One of SoniPy's requirements is that one must be able to access the python interpreter and all that that entails (developing other modules, data/project specific tools etc) at the same time as accessing GUIs for more mundane or oft-undertaken tasks. This is essential for incremental development: to lock everything off behind an event-driven GUI (as a single program) will inhibit communal development.

Look and Feel: consistency across platforms or platform consistency?
There are two approaches to developing cross-platform GUI tools. One is to try to make the look-and-feel the same independent of the platform, and the other is to use tools which defer to hardware-specific routines. The main tools for the former are TCL/TK and OpenGL, and the latter includes FLTK, GTK+ and wxPython. After testing, we decided to follow the second approach, mainly because the visual results were cleaner, more stable and faster.