Yes that's the sound. As Mr Cox says you can either richen the needle or bring the compression up.

If you are looking for maximum power you would bring the compression up, until the engine just smoothes out. You can then lean a bit more until you get the surge again, then increase compression until just smooth.

Keep doing this until you get the leanest possible setting which will be max power. You may want to fly with a richer setting than this though (remember to back off the compression first before you richen up though).

Maximum power is with the leanest possible needle and just enough compression to prevent the surging or maybe just a little more compression. Too much compression and the engine will 'go hard', slow down, knock, sound 'metallic', and/or overheat. Back off compression immediately then richen in this case.

When you are ready to fly set a slightly rich needle and just enough compression to prevent the surge. When the propellor unloads in the air it might start surging again. You can try a little more compression to prevent this but remember the symptoms of over compression. If the engine over compresses in the air be ready to throttle back, land, and readjust.

You can hear the slight miss (surging) in Mr Cox's video when he throttles back.

Dave H