Audio Schematic Analysis

Job ID: 37450757

Budget: $25 – $50 USD

I have this audio device that I am developing. The Audio works fine, however the output is a bit low. I have been told that I need to replace some resistors to increase the output level.
Can you analyze the schematic and recommend resistor values to increase the Gain to 1, 2, 3, and 4 ?

The schematic is in the attached file. Please check it out.
Please share the link so I can browse your previous work and portfolio.