Example image of eyePlorer eyePlorer map for 'Synthesizer': Electronic musical instrument Frequency Headphones Loudspeaker Signal (electronics) Musical keyboard Elisha Gray Invention of the telephone Robert Moog Switched-On Bach Musical Instrument Digital Interface Yamaha Corporation Yamaha DX7 Personal computer Analog synthesizer Digital synthesizer Digital signal processing Software synthesizer ADSR envelope Low-frequency oscillation Timbre Waveform Tremolo Audio filter Ribbon controller Touchpad Pitch control Portamento Resistor Electro-Theremin Ondes Martenot Persephone (musical instrument) Trautonium Korg Prophecy Kurzweil Music Systems Moog synthesizer Yamaha CS-80 Continuum (instrument) Harmonica Melodica Saxophone Trumpet EWI Lyricon Yamaha WX5 Zanzithophone Recorder Theremin Vocoder Accordion