Hey John,
The Carter guitars have a feel stop mechanism (extra changer/scissor finger below the bottom string w/t pull rod).
No anomalies that I notice. I tune the C#->D with the B pedal (G#->A)
I have videos on my social media page although designated mostly to lead tones. I believe a have a video or two with proper chord work while tuning up. Check it out.
https://en-gb.facebook.com/pg/mister25000/posts/
Low E on Extended E9
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