I was asked about the SansAmp BDDI v1 so I went through my notes and created an EQ to simulate it. Of course one single EQ can’t properly emulate the pedal. But this is the basic idea.
It is a shelving EQ and I have my secret shelving hack that no one knows about ( until now ) and it is 100% legit too. ?. Some tricky math will be needed to set the bass and treble controls independently. But look in comments for 2 more examples.