Kurzweil Forte - Manual (Page 55)

Features of the Forte and Forte7
3-10
Audio In
On the back panel of the Forte you will find a ⅛” sized stereo audio jack labelled AUDIO
IN.
You can plug your MP3 player into the Forte and play along with the recorded music.
Volume and FX can be adjusted in Global Mode by pressing the AUDIO_IN soft button.
See AUDIO_IN (Audio Input) on page 12-24 for details.