Ahaha, friends, the boot of SECRTS cap'tain dbrouille! Six months ago that I use this little machine and The trick is when you have speakers bof_bof you can thanks this thing gray "customize" your sound depending on the size of your pice, your position compared to pregnant and delivered at the FHZ celles_ci. In order, you have a simulator 3d effect (for sound "envelope"), a calculator reverb from the size of the pice o You work, a small qualo to correct the default read your speakers elle_mme pice o (which is not ngliger). The icing on the gteau: If you organize small CANCEIS dvd you can simulate the "cinma" with six types of reverb that you can fiddle even if you feel like saying. So all in all for a reasonable price is a good investment.