Acoustic straps will have a tie string for the neck. Standing up or sitting down is user preference. As noted in a response to your original post, fingers will have a tendency to touch other strings until you have trained yourself on how to position them. Lisa discusses this in her course as I noted in your original post. There aren't any shortcuts to this. You've got the guitar now you have to get into the habit of practicing and working through her course.
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12/31/2020 8:24 am