I can see that you are not really experience in Recording and in Live Sound and also that you need to learn more on basic concepts of different audio signals and different impedance in the context of audio engineering.
You should Google concepts like "Instrument Level Vs Line Level" , "Hi-Z vs Low-Z", "uses for a DI box)
To explain everything that is wrong in what you wrote I would have to write a long post here, and this thread is not about a tutorial on those subjects, it's related to the discussion of circuits that could convert "an instrument unbalanced Hi-Z signal into a balanced Line Level (Low-Z) output,
so there's no need to hijack this thread for something that you could and should learn elsewhere.
If you want to do a separate thread for learning these concepts I would gladly post there and help out, but not here. I've been teaching these subjects for 7 years in an Audio Engineering school and have been using them professionally since many years before until the present,
I will for sure write in another thread.
Again, that couldn't be further from the truth.
Professional Live Sound Stageboxes have mostly MIC INPUTS only, the ones that even have some Line Inputs are an exception, and all inputs are Balanced and use an XLR connector.