Something like making a new audio amplifier is pretty specialized, but you don't need any advanced math (Not even algebra) for some of it. As long as you're still pretty much thinking time domain and you don't need to calculate frequency responses and RF stuff there's lots to do.

But then again my only analog experience is just IO stuff for digital, I've never done anything interesting in pure analog, I think if you're a real analog enthusiast you might get bored of what you can do without math.