Yamaha PSR E253 The PSR-E253 is fairly light for a keyboard---just under 4 kilograms (almost 9 pounds) and is 94 cm x 10.6 cm x 31.7 cm (H x W x D). The tone generation method used in keyboard is Yamaha’s proprietary AWM (Advanced Wave Memory: essentially a sample play-back engine) and it offers up to 32 voices of polyphony. There are over 372 loaded instrument “voices” along with 13 different ...