Re: Suppressing engraving of string numbers on all voices simultaneously

[Lukas-Fabian Moser]

\layout {
    \context {
      \Staff
      \omit StringNumber
    }
}

Or, even shorter:

\layout {
   \omit Staff.StringNumber
}

I do not know if this is completely equivalent,

It isn't.  It omits the StringNumber for _all_ contexts that can be
addressed as "Staff" from inside, including the TabStaff.  So it
definitely is not what the OP wants.

Ah, I see. Thanks much!

Lukas