I felt I should post because Jesse built a gorgeous 7-string bass for me. As others have said, his communication and ideas speak of a wonderful person, let alone builder.
My goal tone to get is a Tony Levinesque singing warmth, as on early-90s King Crimson. And this does pretty well, although I will be getting preamps soon as I want to be able to tweak more.
I do have some issues which are keeping me from using the instrument more:
1) I'm currently not in a band experimental enough that I can do my multi-instrumentalist schtick which is nobody's fault but my own.
2) I move when playing music. A lot. So I have the usual issues with the stand when I apply vibrato and am too chicken to try to fix it yet. The part I don't understand is that if I make the teeth on the two round parts mesh, the instrument is either 100% vertical or horizontal. When I try to set it at a comfortable angle, the teeth don't mesh perfectly. I've actually had the instrument start to swing towards the floor a couple of times, which is terrifying! Any tips on that?
3) I'm not sure I have the strings tuned as intended. I tried tuning from F# on up, but they were too floppy. So right now I have the instrument tuned like a giant 7-string guitar, one octave lower. Musically I enjoy this because I can practice bowing these giant flamenco arpeggios. But the fact is that I can't tune the two thinnest strings much higher as they are very taut! (The bottom 5 strings feel fine in this tuning) For those people that use C and F strings above the G, what kind of strings do you use and what gauge?
I did ask Jesse some time ago about the thinner strings and I think they are some sort of extended scale cello strings but even he was fuzzy on the details and possibilities, which is why I came here.