Can someone clarify the meaning of the small circles that appear to be joining wires together? A specific example of my confusion: the Lo and Hi input jacks have 2 outputs named A1 & A2. A2 has an orange wire connected to the tip side of the input, but there is a green wire connected to the sleeve side of the input. these wires join together in a circle. Graphically it appears these wires are to be connected but this would result in a direct short across the input signal.
You're using shielded wire for these connections. The green part indicates the shield layer outer wrapping, where it connects to the ground part of the jack. The red line indicates the inner signal carrying wire. You then run this wire over to the connector lug near V1. At that point you cap off the shield layer, and only connect the inside signal wire.
Also on the Hi input there appears to be a diagonal black connection between tip and sleeve which also makes no sense.
It's a switching jack - and the top lug is the switched lug - when a plug is inserted the ground connection is disconnected.
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