There's this thing, you see, and it's got a speaker and a microphone, and a 1/4" speaker input with an XLR output, and it's sealed so most of the sound stays inside...... I can see it in my mind, but haven't the slightest idea what it's called, and whether or not it's even feasible for bass. I record bass lines at home for other people, but recently I've been getting asked to use "this amp" and/or "place the mic a foot farther away than you are" (from those who don't realize I run direct). I live in a condo near a well-travelled road, and mics don't like the extraneous noise. Can someone tell me what I'm talking about, and what are some good options if indeed this is a useful thing?