Harley Benton HB-40R User Manual page 16

Connections and controls
8 [MIDDLE]
Control to adjust the mids.
9 [BASS]
Control to adjust the bass.
10 [REVERB]
Control to adjust the intensity of the reverb effect.
11 Aux input for connecting an MP3 or CD player (3.5 mm mini phone socket).
12 Headphones output (3.5 mm mini phone socket).
When you connect headphones, the internal speaker is automatically muted.
13 [LINE OUT]
Output jack for connecting an additional amplifier or recording device (3.5 mm mini phone socket).
14 [FOOT SWITCH]
Connection for an optional footswitch (1/4" phone socket).
Use a foot switch to toggle between the channels of the amplifier.
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guitar combo