LG KS20 Operating Instructions Manual page 71

MIDI Ring Tone/MP3 (Speaker)
MSM7200
(U100-1)
MIDI Ring Tone/MP3 Mode is routed as below
MSM7200 HPH_L -> AMP(U401) -> Loud speaker
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Headset
AMP
(U402)
AMP
(U401)
Voice
Voice + MP3 + MIDI
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3. TECHNICAL BRIEF
Head_Set
Receiver and
Loud Speaker
Analog
switch
(U400)
MIC
Head_set MIC
LGE Internal Use Only