Sony PCM-D100 Operating Instructions Manual page 16

Identifying parts and controls (continued)
Remote control (transmitter unit)
16

 PAUSE button
 
STOP button
 
(review/fast backward) /CH1 (channel
1) button
  PLAY/CH2 (channel 2) button
 
REC (record) button (page 30)

T-MARK (track mark) button
Adds a track mark at the current position of
the selected file.
  (cue/fast forward) /CH3 (channel 3)
button

SET button (page 31)
Press and hold the SET button and press CH1,
CH2, or CH3 to set a channel to the remote
control.