I use my TightDrive all the time. Mine has the blend knob. I'm not after clean tone, but I'm also not after huge buzz-saw distortion. I find it really responds well to playing dynamics, far better than anything else I've tried and very driven-tube-amp like. My signal chain goes like this:
P-bass>tight drive>Boss EQ in the tight drive effect chain(pre-tight drive)>Sans Amp>Ampeg V4
I put the EQ in the tight drive's effect chain to emphasize certain frequencies. I play in a band with three guitarists and a Hammond organ, so sonic space is hard to find. The EQ in the chain is perfect because I can spike up the mids in the 1-2K range and slice through any mix. I usually give the low end a little bump too just to maintain some fundamental bass tone.
What I really love about the Tight Drive is how righteous it sounds through a DI and to the PA. That's really what I was looking for from this pedal. Most overdrive/distortions just sound terrible through a DI and a PA and you end up having to mic an amp as well as DI your bass. Then you put total control and total faith in your sound guy to mix your dry and wet signals, as well as running into the dreaded phase problems. The tight drive allows me to be in control of my tone because I can trust how it sounds through a DI. To my ears, the TightDrive to the Sansamp straight to the PA sounds just like a mic'd tube amp that's being pushed to the point of overdrive. It has great dynamics and is super responsive to playing. I can hammer the notes with my right hand and get big overdrive sounds or I can play lightly and get nice smooth overdrive. I can switch it on and off at my feet and have both great clean tone and great overdrive tone with just one DI to the board and one line to my amp, all while staying in control of my tone and being able to sit in any mix perfectly.
Also, it's true bypass so when it's off it has no impact on my chain and the EQ is also removed from the chain. The effects chain on this thing opens up a huge world of possibilities that I've only begun to experiment with.
I can't say enough good things about this pedal!!!!
Shameless plug: Here's a video of my band playing. The bass on this was recorded with a P-bass into the TightDrive into a mic'd V4. http://www.vevo.com/watch/autumns-ca...s/CAB401200128