Problem Statement

Load at least two prerecorded sounds, and demonstrate as many of these features as you can: Describe: [Note: If it seems to be a good idea, this task may be revised to specify a particular timeline rather than just 'demonstrate these features'.] Where applicable, please categorize examples primarily by the audio facility used (library/API/program/platform) rather than the language if the language is incidental (e.g. "Mac OS X CoreAudio" or "mplayer" rather than "C" or "bash").

Let's start with the solution:

SoundPlay, %A_WinDir%\Media\tada.wav, wait
SoundPlay, %A_WinDir%\Media\Windows XP Startup.wav, wait

; simulaneous play may require a second script

SoundPlay, %A_WinDir%\Media\tada.wav
SoundPlay, Nonexistent  ; stop before finishing

SoundSet +10  ; increase volume by 10%
Loop, 2
    SoundPlay, %A_WinDir%\Media\tada.wav, wait