Record Press the footswitch once. LED indicator shows red, it means SOS looper is in rec status. Hit the footswitch again when you finish your riff. LED indicator shows green, it means SOS looper is in playback status. The riff start to loop continuously. LED indicator flashes every time when reaching the beginning of the loop. The Maximum loop time is 5 mins. -OVERDUB Once you have your first loop, SOS looper would let you overdub your new riff infinitely. To overdub over the riff, single press the footswitch when playbacking the loop. Now the LED will turn from green to red, that means SOS looper is in the recording status again and you are good to go. Press again when you finishing your loop and SOS Looper goes back to playback status. SOS looper plays all the overdub riff when in playback status. The new overdubbed riff doesn't affect the length of original loop and the layers for overdubbing is unlimited. -UNDO THE LOOP Press and hold the footswitch longer than 1.5s to undo the last riff. There is only one last layer that is able to be undo. When undoing the loop, LED indicator will flash quickly. -REDO THE LOOP You might want to redo the undo, press and hold the footswitch again longer than 1.5s, this will redo the loop that you just undo. When redoing the loop, LED indicator will flash quickly. Stop Rec/Play, double press the footswitch, stop recording or start to play. LED indicator will flash in stop status to remain you the loop is still stored and it is ready to go. -ERASING To erase the whole loop, long press the footswitch in pause status. Double press and hold the second setup in Rec/Play Status. When LED indicator li