Started thinking my electronics over a bit and I realised that I'm building an awful lot of digital circuitry using discrete components, namely a LED peak meter and a soft latch power circuit, and I'm starting to think that it's probably best to just use an MCU for all of it. There are a couple of features I could add to the system if I use an MCU, like AGC, peak limiting and USB software control, so it's starting to make more sense to do it that way.