Just to chime in with my two cents.
I have both of these pedals and dig them a lot. They've been mainstays for me longer than any other filter or fuzz which is saying a lot because I've been through quite a few of each.
The Brown dog does vintage to synthy, wide open to tightly gated and full on fuzz to an even blend or mostly clean with some dirt around the edges. And it works perfectly with active basses. Sure, I wish it had a tone knob for the fuzz, but other than that I have no complaints. I may get another fuzz for a different tone, but the Brown Dog is a keeper.
As for the two of them together, they work very well for synthy combos. It can take a bit of dialing in, but there's an array of cool sounds. To be clear, they are harder edged, more modern synth sounds compared to the more 70's or 80's synth tones of the Bass Micro Synth or Deep Impact/G5 but I like them. As an added bonus, the envelope connection between them means that your dynamics still control the opening and closing of the filter without the compression of the fuzz affecting things. A nice feature.
Here's a short clip with the Brown Dog set to a more modern and gated tone and the 00Funk in downsweep mode. I play through the lick twice because I was actually comparing two different octave pedals (MXR Bass Octave Deluxe and Boss OC-2) which is the other effect in the clip.
http://www.sonicaether.com/soundclips/synthtest.mp3
The Octavius Squeezer is a pretty amazing little piece of gear. It has all the functions of the 00Funk and Brown Dog and a ton more including beat locked effects, portamento, an octaver, and wave forms and for not much more than the BD and 00Funk separately. The reason I sold mine though is that it has a very steep learning curve to get everything you can out of it.
Hope that helps.
