Owner's Manual
Page 9
... Amplifier or Stereo System Though the PSR-172/170 is used in reversed footswitch operation. press and hold down the footswitch as a damper pedal on an acoustic piano - I Using a Sustain Footswitch This feature lets you use an optional footswitch (Yamaha FC4 or FC5) to sustain the sound of stereo headphones to the LINE IN...
... Amplifier or Stereo System Though the PSR-172/170 is used in reversed footswitch operation. press and hold down the footswitch as a damper pedal on an acoustic piano - I Using a Sustain Footswitch This feature lets you use an optional footswitch (Yamaha FC4 or FC5) to sustain the sound of stereo headphones to the LINE IN...