You do not see 1/Left, 1/Right, 1/Stereo, 3/Left, 3/Right, 3/Stereo and so on. AFAIK SONAR has always displayed inputs this way.
1/Left is input 1
1/Right is input 2
1/Stereo are inputs 1 and 2
3/Left is input 3
3/Right is input 4
3/Stereo are inputs 3 and 4
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