The Akai DX-49 is a 49-key keyboard synthesizer that was introduced in the late 1990s. It features 128 voices of polyphony, 100 preset sounds, 100 multi sounds, and 32 DRUM! patterns. The keyboard also includes a built-in vocoder, arpeggiator, and sequencer. It uses the DX Fernando format for expansions, allowing users to add more sounds to the synth. The DX-49 is MIDI compatible and includes both USB and DIN MIDI ports. Overall, the Akai DX-49 is a versatile synthesizer that offers a wide range of sounds and features for musicians and producers.