Analogman king of tone build help

[Lost_soul]

I build this one for a friend and it worked first time and i couldn't believe it since it's a big build.

There are a couple issues i noticed though. The first one is when i turn the drive knob on both sides all the way to max, it makes a very high whiney high piched sound.

For the second issue, in the pedal it has 4 switches that switch from a clean boost to distortion. 2 switches on each side.
So when i gradually turn the switches on one by one, the sound level decreases! Idk why this is happening. It happens with both sides and not only one side so whatever the problem is it's not in one side.

Here is the layout i followed:



I made 2 of the same board exactly so i can achieve what the V4 is.

Some changes i made: i used 1N4148 for all the diodes that are connected to the switches. I used an RC4558 Instead of the jrc4580.

Here are some pics:











And here is a sound Sample for the decrease in sound level i am talking about.
The sample goes gradually from clean boost to overdrive to distortion. Each new sound im turning on a switch and you can notice when reaching the end it becomes really low level.

[PRR]

All those wires. Each one acts like a radio antenna, either sending or receiving. They are not so very long, but they are not far apart at all. If the circuit between can be adjusted to high gain, it is pretty sure to catch its own output, feed-back, howl like a Shure PA system on 10. Instead of acoustic howl, it is electromagnetic howl. So strong that the amplifier can't work properly.