In more complex situations, you can set individual config for every included sound you want. Individual config will override the default one.
This is helpful then you store your sounds in different directories and/or want to play them with different volume and etc.
Alias is a shorter name for the sound, you wish to play. With alias param you can easily turn long name "computer_alert_beep_sound" in to short "beep".
Loop is a param to repeat sound N times. For example set it to 10 and sound will be repeated for 10 times, or set it to "true" for infinity.
Controlling playback is easy. You have 3 methods for that: play, pause and stop. Just call method with sound name and it will work: ion.sound.play("witchdoctor").
If you will call this methods without params, like this: ion.sound.play(), it will try to play, pause or stop all(!) connected sounds.
Be aware of multiplay param with long sounds or music files. If set to true, it will allow plugin to create any number of audio instances and you will able to control only the last one.