Here's a picture of my "live" settings for the Boss DD-3.
If the room is very dry I turn up the E.level to full.
The Boss met my needs though and recreates the sound I have on our records so I looked no further.
Anyway, I AM in good company with the DD-3 as Scotty Moore (Elvis Presley) also is using one nowadays alongside with a chorus (to emulate the frequency impurity of a tape echo). I haven't tried this one myself, but the online sound samples on BOSS' website sound pretty convincing to me.
I often get asked how I set the Sans Amp GT2 pedal to get a vintage sound.
Here's a page with photos of some actual recording sheets (for "Anyhow" among others) where you can see how the Sans Amp was set. The Sans Amp GT2 pedal was made to be used as a line-in effect between a guitar and a mixer (hence the name; "Sans Amp" which means "Without amp").
I then use the Sans Amp GT2 pedal that can emulate the old Bassman as an insert between the amp and the guitar. The pedal can also emulate a lot of other legendary amps quite good, but so far I never used that.I have just over 1,000 legal miles on my 73 TCS since finishing her up.I added a MSD Ignition unit to help control detonation under boost.Actually I started out playing a vintage Vox AC 30 and it wasn't bad at all. That's very impractically when you play live, where you have to adjust the volume after the size and acoustics of the place where you playing.The sound was very Many Rockabilly guitarists play a '59 Fender Bassman (or similar) - vintage or reissue. I found a way to get around that and always have the same "Bassman-sound" no matter what volume I'm playing at...