How to improve this guitar amp?

Hey, this is the schematic for the Danelectro Honeytone guitar amp. I know briefly what most of the components do, but I would like to know how I could improve the circuit. If you were to change some of the components or configurations what would you use instead? I specifically mean the resistor and capacitor values and their arrangements only as i wish to keep the TL072's and the TDA7052 power amp. Thanks.