Thank you so much for your kind words! I’m really glad to hear that VGC is working so well for you and that the 'Sync Audio' feature is helpful.
Actually, you can already adjust the volume using the Up and Down arrow keys on your keyboard!
I am currently working on a reworked version of VGC with a cleaner codebase. This will soon allow you to set your own custom keybinds and even choose your own UI colors. If you encounter any bugs, please feel free to let me know on GitHub. Thanks for the support! :)