Hi,
you can make very long Audio MultiPad, as long as you want, because this one is read directly from intern HDD or from other external USB device (Audio Link Function).
However, you can't play all audio multipad together, just one by one, and it will not follow tempo if you change it ( unless the audio file is a REX file or if it is edited with Audio Phraser, but in a restricted tempo range of about -10 to +10), or chords you'll play.
Very important: the audio file MUST be formated as 44 Khz and 16 bits.
Regards
Seagull29