Changes

=== Mic Pre-amps ===

Some mics require phantom (or actual) power to operate correctly. Some people believe mics need to be run through a pre-amp to sweeten up their tone. Pre-amps can also provide common effects like compression, EQ/filtering, or mild distortion. I don't know much about mic pre-amps, but most professional studios do tend to use them, often being incorporated into the mixing board, before converting the analog signal to digital for recording and post-processing. As such, they can be an important part of the signal chain, having either a subtle or profound effect on tone.