Volume control on a Bauman 312 board?

Yes I'm using Baumans PSU.

I'm using the parts list Greg made and bought all the exact same parts.

The power supply is in aa external box and I have yet to do any mods to it.

Honestly I just wanted to get it working before I tried making it sound better.

I must have killed the other 2520 opamp with whatever happened. It doesn't work anymore. I had two more here at home and I put them on the on the cards. Both are now passing audio fine.

The LM317 voltage regulator on the PSU for 48 volts fried. I swapped it out now I'm back to where I started. Trying to get the gain knob working.

there is an option for using 8pin dip opamps right ?
might want to do that to save the 2520 ,

I'm no great constructor but it looks a little messy ,
you may have to start from the start and check ALL the wiring
in a logical signal oriented fashion .
With no opamp check the supply , visualy check the wiring
using a hi lite pen and schematic going point to point when
you are sure the colors & connections are correct , also at the
same time inspect all the solder joints perhaps using a multimeter
to check intentional and unintentional grounding
Confirming things one at a time .
The beige 5 % resisters i can almost tell without looking at them
but the blue 1% are harder for me to see , if this is the case for you
some desoldering may be involved but in doulbe checking the whole
circuit

btw before the regulators my grs see almost 64v , it of course gets regulated down to 48

it sounds like it's so back & forth that short of rewiring it you need
some kind or order , good luck regards Greg