Dreamer , not quite true, at least with the current OS.
Donny is refering to multitasking..All the medias can run at the same time..MP3, Wav, Seq and styles...
You can trigger short wav s while a sequence is playing or even an MP3 or a style..For an example you can have a vocal phrase or any recorded sound that is saved as a wav..
A style can be played with an MP3 or wave, but it is not synced...you have to tap tempo or match the tempo read out..