Dear Stuart (et al.),
I didn't understand exactly what software you are looking for, but if you want your students to play with classic psychoacoustical tests in a matlab environment I recommend PSYCHOACOUSTICS, the toolbox we wrote a few years ago. The toolbox includes ready-to-use experiments but also functions for synthesizing sounds and functions for running threshold estimation experiments with adaptive procedures (maximum likelihood, PEST, classic staircase).
The relevant information is here:
The webpage to download the lot is here:
In addition, we recently moved PSYCHOACOUSTICS online. The online version has (of course) less flexibility and experiments but the student does not require any installation or proprietary software and the tool can be used even with a mobile phone. NB: the toolbox is currently under review in "Behavior Research Methods".
Here the link to the toolbox:
Here is the link to the paper companion of the toolbox;
Of course, you should warn your students that psychoacoustics experiments can give addiction :-)
All the best from a still-too-hot-to-be-October Italy,
m