QuadPlay for Windows
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Open a command prompt and navigate to the folder you have installed QuadPlay to.
Now type "quadplay" (without the quotation marks) followed by the name of the song you wish to play. The song should play. For example, if you have the file "BELLON.8XP" in the same folder, type:

quadplay bellon.8xp

...at the prompt. You can specify a different sample if you like instead of the default square wave - just add the filename afterwards.

quadplay bellon.8xp steel.wav

Now, if you like there are some command switches. To enable them, type a dash then the letter. The switches are x (eXtended notes - the notes play their full length), m (Mono sound outout) and l (Low quality 8KHz mode). For example,

quadplay bellon.8xp steel.wav -xm

...would play "BELLON.8XP" in mono with extended notes.

When playing, there is a status line made up of three parts:
Note - this displays how many notes have been played in the current section (decimal).
Section - which section are we in? Note that this is the progress through the song, not the actual index of the section. The number in hex after the section number is the address of the section data inside the song file.
CPU usage - just to make sure I don't overdo it!