How to loop sound without delay inbetween

i would like to loop a certain sound without a delay inbetween each loop of the sound, how do i do this?

Instead of using a block to play a sound until done, try starting a sound then using a wait block. To find how long you want the wait block to be, use the duration of the sound minus 0.03 seconds (maybe you'll need 0.02 or 0.04).