The simple, small tools for creating an amateur music are becoming increasingly popular. Particularly interesting are the applications that open applications online. Here are two, that I found on the Web
Soundation Studio is a powerful tool for creating music online. And even though we have always been trying to keep it as simple as possible it can seem a little scary for new users without prior experience in audio production. That is why we created the Learn section here on soundation.com.
Cyclerhythm is the second, created by Byetone (Olaf Bender). Its is flash application that allows to remix his set.
These two tools are completely differ greatly in the way of use. The first is the classic timeline, the second a more abstract way to visualize sound. With respect to digital tools to create architecture comparing it to classical AutoCAD, which is only in the concept of a digital plotter board, which completely not leverages the power of computation, and the increasingly popular ways of generating shapes through scripting (Processing) It seems to me that the future is going towards building your own tools, as Alva Noto speaks about building your own instrument.