to keep this brief I am designing some audio circuitry and also need to design the power supply. The barrel jack in the schematic below sees 18VAC and I am converting that to +/-15V DC rails. 

[![Schematic](https://i.stack.imgur.com/NN0Ap.png)](https://i.stack.imgur.com/NN0Ap.png)

So to tackle this I have routed out part of the board in the hopes that I can control the flow of the ground current and voltage currents while isolating any noise that may come from the other circuitry. Also note that the panel the audio jacks connect too will be grounded.

I am concerned I have overlooked something and was wondering if anyone with practical experience could advise on some things I may have overlooked. Or even if any of this is necessary.

[![Layout](https://i.stack.imgur.com/hEYYS.png)](https://i.stack.imgur.com/hEYYS.png)

How do I use slots in a PCB design such as this?