Double tap “T1” (left of screen)
Select your sample and press “Enter/Yes”
Press"Exit/No" to go back to main screen
Make sure “T1” LED is red or green (hold “Funtion” then press"T1" if yellow)
Press the red with small black circle in the middle, button
Press any of the 16 grey circle buttons on the bottom of the Octatrack
Press the grey with small white triangle in the middle, button

You should hear your sample now, if you have correctly connected the Octatrack to your sound system.