I don't use DI enough and in different enough places to ever have used a ground lift switch, but I've been told by at least three people that they are essential and a dealbreaker if it isn't there, so the DI will absolutely have a ground lift. I didn't even think about pre-post EQ, that's a good idea. I'll see if I can squeeze that into this design without tearing up too much, otherwise it may have to go in the next version. I really like the idea though.Personally, I think that a grande-sized edition of a pedal that is undoubtedly a bit pricier, but also includes an XLR DI, ground lift switch, and maybe even a pre/post-EQ switch, would be the edition that quite a few bassists would want as their central hub. More or less, Darkglass has made a single pedal serve three markets several times over with this approach, and though I enjoy using my RNDI now, it wasn't that long ago that I only even gave a second glance to preamp pedals that contained a top-notch XLR DI output. (in fact, I sold my Le Bass strictly because the DI was 10dB noisier than I wanted)
Headphone out would be desirable for sure, I'll have to revisit my old headphone amp schematic and see what I can work out. Aux in would be a little trickier, but I'll see what I can do on that one.Add a headphone out, and maybe an aux in, and even more folks would beat a path to your door.
There was a design posted on DIYstompboxes a few years back called AEFEA - Almost Everything for Everyone Almost@Sushi Box FX you know this "too many options" thing can be fixed by just making one giant pedal that does everything.
You could call it, Everything