The Amiga has four audio channels. Channels 1 and 2 are connected to the
left-side stereo output jack. Channels 0 and 3 are connected to the
right-side output jack. Select a channel on the side from which the output
is to appear.

[1]: Belage says (in November 2020):

[...] in the printed manual Amiga HRM 1e, 6th print, August 1988, page 136 you can find the following:

DECIDING WHICH CHANNEL TO USE

The Amiga has four audio channels. Channels 0 and 3 are connected to the left-side stereo output jack. Channels 1 and 2 are connected to the right-side output jack. Select a channel on the side from which the output is to appear.

[...]

So in the web version you find: 0-3 = R-L-L-R.
In the printed manual you find: 0-3 = L-R-R-L, which is identical how the real hardware works.

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