Prints a measured strip. If a ruler disagrees with it, your printer is scaling the page.
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The grand staff is two staves, treble above bass, joined at the left and read as one system. Piano music needs it because two hands cover a range no single staff holds without ledger lines everywhere.
The gap between the two staves matters as much as the line gap itself. Middle C and its neighbors live in that space on ledger lines, and if the staves sit too close the pair reads as one ten-line blur. Here the gap scales with the line gap, so the proportion holds at any size you print.
Barlines run the full height of both staves, which is what binds them into a system rather than two staves that happen to be near each other. Clefs and key signatures you add yourself, and the brace is a straight heavy rule rather than an engraved curly one — the generator draws only lines and circles, and an approximated curly brace would look worse than an honest straight one.
2mm is standard. Wider for ledger lines, accidentals and fingering.
Yes — the gap scales with your line gap.
No clefs. The brace is a straight heavy rule rather than an engraved curly one, because the generator draws only lines and circles.