Tone Control Modifications

As you do not have a split supply: R7 and R9 need to go to the junction of R10/R11.
Insert a C with a R (1k?) in series after the tone control feedback loop after U1.1. The R will limit the load on U1.1 and the C will keep DC of the Volume control.
Add a C at the output of U1.1.
I did not look at power amp circujt. E