LG KS20 Operating Instructions Manual page 72

3. TECHNICAL BRIEF
MIDI Ring Tone/MP3 (Headset)
MSM7200
(U100-1)
MIDI Ring Tone/MP3 Headset Mode is routed as below
MSM7200 HPH_L, HPH_R -> 18PIn MMI ->Headset
LGE Internal Use Only
Headset
AMP
(U402)
AMP
(U401)
Voice
Voice + MP3 + MIDI
- 74 -
Head_Set
Analog
switch
(U400)
Receiver and
Loud Speaker
MIC
Head_set MIC
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