[quote name='lemmywinks' post='1224906' date='May 9 2011, 11:19 AM']MXR M80 has a Blend control too. Both the EQ and Distortion circuit are switchable, on the Sansamp it's just the Distortion AFAIK.[/quote]
I [i]think [/i]the BDDI is like this:
Powered but 'off' - works as a clean preamp and DI.
On, blend control to left : treble and bass controls work only
On, blend contol to right : treble, bass, presence and drive all work.
Pretty flexible. Still, what you can't do is have just the distortion without the EQ, though you could try to set it to flat.
If I see an M80 going cheap I might have to grab it and try it out too!