 Many of its samples come from the T3 Series and 01/W Series synthesizers.The X3 features 339 samples compressed into 6 megs of ROM, and Korg beefed up this model in areas where previous models had been weak (organs and strings, for example).The X3 lacked several key piano samples that had become popular in the M1 and 01/W series, replacing them with different samples altogether which were (arguably) not as good-sounding as before.