About the Short Bass One: I have one. It cost me about $550 with shipping from Britain - it was a store demo. I don't think they are making them now. I have seen a few on Craigslist selling for $400-500. I don't think they were ever actually sold in the US but a few people like me bought them from Europe.
How loud is it? I don't have the Goldtone UBass I do have the Kala one and I have played the Goldtone. The Shortbass is louder, a bit. It isn't really loud enough except in very limited situations. It is also pretty crudely made with very badly finished frets. I use it mostly for practice without having to plug in. But it didn't work where I needed it to. I was playing bass where I could not use an amp. I ended up using a Luna acoustic ubass with strings the same as the bottom four strings of an acoustic guitar. With the sound being a little bit higher in pitch and using a pick I could be heard acoustically. I also found that a standard acoustic bass guitar with steel strings was louder than the Short Bass One. In the end I got tired of not being amped and figure that if I can't use at least my Double Four my bass isn't wanted.
You would not be able to hear a ShortBass One around a campfire with a couple of guitars. You could probably hear it with two acoustic guitars in a bathroom.
How loud is it? I don't have the Goldtone UBass I do have the Kala one and I have played the Goldtone. The Shortbass is louder, a bit. It isn't really loud enough except in very limited situations. It is also pretty crudely made with very badly finished frets. I use it mostly for practice without having to plug in. But it didn't work where I needed it to. I was playing bass where I could not use an amp. I ended up using a Luna acoustic ubass with strings the same as the bottom four strings of an acoustic guitar. With the sound being a little bit higher in pitch and using a pick I could be heard acoustically. I also found that a standard acoustic bass guitar with steel strings was louder than the Short Bass One. In the end I got tired of not being amped and figure that if I can't use at least my Double Four my bass isn't wanted.
You would not be able to hear a ShortBass One around a campfire with a couple of guitars. You could probably hear it with two acoustic guitars in a bathroom.