[quote name='PaulWarning' timestamp='1460285413' post='3024313']
I'll have to check that out, I use the bass drive effect for a bit of overdrive, it certainly adds bottom end
[/quote]
I've been trying to find a response curve of an actual BDDI but haven't been successful yet, but according to the details I have been able to find, you EQ centres are different.
But what I tried to say, for the benefit of JTUK really, is that for example, if you had a pedal that had a steep cut at 800hz (Lets say -10dB) - by boosting that frequency elsewhere (say +10dB) then you'd go a certain distance to cancel out the effect that the cut was having in the pedal.
In the real world where we suffer from phase differences and varying 'Q', it doesn't quite happen perfectly. So not a perfect situation but certainly not a 'weird story'.