Rusty~
No issues with overdrive from the SF-2. Remember I am not using the SF-2 as a preamp (in this situation). I patch directly out of the back of the DS-5R, Bass output to channel 1 and treble (bridge) output to channel 2 all on the rear panel of the SF-2.
From the rear panel outputs of the SF-2 I patch directly into the Mackie, then of course Main Outs to the amps.... and yes I have had issues with the mixer, (I cannot remember all of them right now), adding coloration; but have rectified all that now where it is completely silent. I can even mute each channel by the fader!
In my (

space Rack ~ (I swear its not that heavy ~the Eden head is the worst part) ~ I placed the (small format) Mixer in a Rack Drawer and doubled up velcro on the back side of the mixer - to the velcro added to the shelf of the drawer, velcro\d the power supply down, made patch cabling to reach all the inputs/outputs to where or when the drawer is open or closed, and patch cable to a 1/4 Patch Bay on the Racks Front to any of the amplifiers (or effects back to mixer if I choose)... works like charm.
So Rack top to bottom is the 2 Space Rack Drawer (with Mackie), The Patch Bay (1 space), Furman Rack Power, SF-2, DS-5R, Eden WT-550. All wiring is at the rear of the rack with the exception of the outputs of the Mixer Mains to the Patch Bay to the heads. The other Head sits on top of the rack and is also fed from the Patch bay.
By the way even with all the patch cabling it is still quiet except for any over eq\ing at the heads.
Here is another thing, (you may already know), but while talking to Will (Gunn) after getting frustrated he enlightened knowledge to me on the best way to setup the SF-2 - Volume wise. Here goes... The filters Gain on each channel is at Unity Gain at 1:00 O\clock. The Direct Gains can be addressed in a similar fashion where you could have them open all the way but its better to begin throttling back. This is your Starting point. Keep in mind my Series bass is Sans Filters so you may encounter more gain from your bass. Below is my response back to confirm I understood what Will explained to me,
Will,
Here is what I got out of our conversation and what I will try on my SF-2/Rig setup.
SF-2/Series Bass Settings:
Think Subtractive!
Both Pickups set full up (wide open).
Input Gain/ Direct Gain Channel A:
Set @ Full up subtract to remove highs when trying to play with a mellower tone;
(remember Gains are NOT (amplified) volume additive, but instead are Tone additive!
Direct Gain Channel B:
Same as above
Filter Gain Channel A:
Set Frequency Gains at 1:00 (pm). This is Unity Gain on the unit. Do this on both channels Filter Gain controls.
Filter Gain Channel B: as above.
Remember to think Subtractive instead of boosting (Bass or Treble Frequencies, etc.)
Enough rambling now,
Rich