Thanks for the reply.
I don't know what would be best to do what I want. I am only an amateur/hobbyist when it comes to electronics.
So I would like to be able to have a headphone-amp type device that I can plug my instrument into so I can put a small ear-bud in my ear to hear myself, but at the same time be able to send a direct signal from the transducer to the mixer without any signal loss (a mid-range decrease would be nice however).
So I'm looking for some input, ideas, suggestions, schematics, kits, or actual products.