I was pondering this last night, before going to sleep.
They could be using springs and resonating chambers. The springs have sympathetic vibrations like your strings have sympathetic vibrations.
Though he refers to it as digital. Which, frankly, kinda makes sense. I mean, those are variable knobs - pots if you will - that have to be hooked to something and I'm willing to bet a dollar that they're not connected mechanically to anything.
I was thinking they might have a speaker of sorts inside the guitar body.
It's gotta be something. I have a hard time thinking there's no electronics involved in that. You can do a lot with springs and resonating chambers - but those are typically huge.
And, buggered if I know what I'd do with a semi-hollow 7 string guitar. It's not like I'd be covering anyone with it.
Also...
Something strange has happened since deciding to start this cheap guitar project...
I haven't been this excited about playing guitar in a long, long time. I'm legit excited. Normally, I ignore the whole community but I've probably watched 60 hours of video and done another 100 hours of research.
I'm legit excited about playing guitar again. Not a little excited - super excited.
The only thing I can thing of is if you were accompanying someone playing on a capo you could play a low D or C along with them
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