This is not my first JVC product and I must say that I have not yet had to worry about with this brand. It's pretty good. The sound is a more than respectable sharpness. We put him a key 32GB Transcend he manages very well. You can include up to 250 tracks in a folder. If you put more, it will read the file anyway, but up to 250 tracks. The only thing I would fault it is that he does not play tracks in the order establishes the key, even if they are numbered. The position taking into account the names included in the file source. For those who insist on the sequence of titles, be sure to change your file by going to the properties of it. To establish the position of the adjustment, be sure to turn off the "demo" mode if your settings Although recorded, will not apply.