The idea with the ear training found here is to provide an "ears-only" version available away from the computer.
Nothing wrong with working on your ears at the computer
(and there are some great resources available),
but it seems like some of the best opportunities for this are away from the keyboard - in the car, etc.
So, select a voice and type of ear training, try
them out in the player, then download the set, and use them in your mp3 player.
Many of the single-note samples were taken from
The University of Iowa's "Electronic Music Studio".
There, Prof. Fritts provides many orchestral instrument samples played in a number of dynamics, and which may be used freely in your compositions.