OSKITONE OKAY 2 Synth, Assembly Manual

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Polarity on middle pads
Note the white silkscreen lines on the top of this PCB.
The thick solid lines indicate the flow of electricity. From the
above image, you can see that it starts from the battery’s +,
moves to the S1 switch, and then is distributed across the
middle pads (from this orientation, the left pad of each pair).
It then goes to each of the pads.
The positive lead of each of the middle pad pairs is therefore
the one touching S1, and the negative is touching its
resp.
The thinner dashed lines indicate ground. They are all
connected together, unconcerned by the S1 switch or any of
the middle pads.