One million fans can't be wrong. So we extended our Music Keyboard with a large number of new sound effects to a Synthesizer Keyboard with 19 synthesizer engines, more than 2500 sound presets, 200 effect parameters, 16 voices polyphony, 8 octaves range, MIDI sequencer, wave sampler and recorder, Sound Font player, auto sustain, global effects, demo songs, MIDI recorder, sound export, waves sample import, low latency audio engine, MIDI input, MIDI output, external keyboards ...