Some audio interfaces have monitoring programs which allow you to apply effects like EQ, compression, even reverb on the way in - I have an RME interface and I know it can do it although I've never bothered, and you can probably apply an plug in EQ in the DAW as something's recording to "tape" - although I've never tried it either.
At least I assume you can... at least I can't see why you couldn't. It would be the only way to, say, apply a limiter if you wanted to stop a particularly loud source clipping on the way in - and if you could do it with a limiter, then you could do it with an EQ, I'd think.