Can the GKP-4 output the signal arriving at its GK IN connector to all of its GK-OUT connectors (A, B, C, D)?

When connecting the US-20 / GKP-4 to a GK-compatible unit, can I use a 10 meter GK cable?

I understand that the GKP-4 distributes its GK input to all four of its GK output jacks. Is my guitar's normal pickup sound also distributed to the four GK output jacks?

The GKP-4 isn't equipped with a battery or a power supply connector. How is power supplied to the unit?

Can I use the GKP-4 to connect two or more GK-equipped guitars to a single GR, VG, VGA, or GK unit?