Rule #1, you are the mercy of the person mixing your band.
You can certainly have a discussion about what you want but they have control. Start by sending a great sounding signal and hopefully the person mixing has good ears, is musical, and has good enough equipment to reproduce a hi-fidelity sound.
Several years ago, I went to Rocco Prestia and Tower of Power, at a local PAC. The sound man assassinated Rocco with a muddy, overly bassy mushy sound with no articulation. One of the baddest cats on the planet and you could not hear one note of what he played.
You can certainly have a discussion about what you want but they have control. Start by sending a great sounding signal and hopefully the person mixing has good ears, is musical, and has good enough equipment to reproduce a hi-fidelity sound.
Several years ago, I went to Rocco Prestia and Tower of Power, at a local PAC. The sound man assassinated Rocco with a muddy, overly bassy mushy sound with no articulation. One of the baddest cats on the planet and you could not hear one note of what he played.

Talk about mud.)