This Superscope PSD340 Music Practice CD & CDR Music Practice System is a portable digital recorder that is perfect for musicians who want to practice and record their music. It features a built-in speaker, pitch control, 3-band equalizer, and a digital-to-analog converter (DAC) for high-quality sound. Additionally, it has input/output ports such as analog RCA/Coaxial out, analog in, S/PDIF RCA in, S/PDIF optical in, and analog RCA/Coaxial in, as well as headphone RCA out, analog XLR out, and RCA/Coaxial out (S/PDIF). With its automixer, built-in microphone, and direct monitoring, this recorder is perfect for musicians who want to practice and record their music without the need for additional equipment. It is also compatible with CD-R and MP3/CD players, making it a versatile device for all your musical needs.