JACK Mono / Stereo

 =============
|             |===========|=\/=\
|             |===========|=/\=/    (Mono)
 =============      G       S1


 =============
|             |======|====|=\/=\
|             |======|====|=/\=/    (Stereo)
 =============    G    S2   S1


G.......Ground
S1......Signal (R / Mono)
S2......Signal (L)

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