There are a lot of different Big Muffs he could have modeled, not all sound like what you mention. I’ve owned a few, and they all sounded pretty different from each other.

I think it is meant to be a Big Muff – it’s not just the “Big” in the name, the Sustain control is a Big Muff thing too. It’s probably what Gary says below, that it’s an emulation of a specific edition of the Big Muff.
Should anyone want a plugin that does sound like a normal Big Muff (and nine other drive pedals), I can recommend Audio Assault’s Dirt Machine (currently on sale at only $7).

Thanks for sharing your thoughts! Yeah, perhaps Big-Sur wasn’t even meant to be a Big Muff emulation, I’m only trying to guess based on the name and the design. But it’s definitely a nice little distortion box, worth the download for sure.

That’s not unusual…

Basically, it’s a great sounding plugin, but it’s not a Big Muff. It’s got too much warm midrange (a Big Muff has famously scooped mids), and it lacks the insane low end sustain and the top end fizz you get from the real thing. But if you stick the sustain to 12 o’clock and crank up the tone to around 2-3 o’clock, it does give you a very nice dirty fuzz sound.

It’s a really good plugin, and you can’t argue with the price, but if you want a free Big Muff emulation, Analog Obsession’s Pig Pie is a better bet (although it’s also got a far warmer sound than the real thing).

Glad to hear that, cheers!

Always great stuff from them. Fairly priced, too.