Close, it's the function 1 button. Here's how I do it, could be other ways but this is what I have figured out. First on the amp itself push the play button then immediately push stop. This brings up the screen with song, drum, recording, and SD across the top. Second I push the right arrow twice to highlight the recording tab. Now I'm done with the amplifier part. On my MKII FBV Shortboard I then press the Function 1 button. You'll notice when you do this that the chanell selected will no longer be lit up. Once you've done this you simply push the A button on the board to start recording, press it again at the end of your loop and it will continue to play until you push the B button. From this point the B button becomes the Play/Stop button, if you would like to overdub your loop you have to push the A button again. The C button, when held down will allow you to clear the track you've just recorded and the D button makes things play at half tempo, hope this helps