I’m using a Lachenmann like bridge clef and a percussion grid to indicate the left-hand finger at the bottom and the bridge at the top (see picture 1). Currently, I am only able to write noteheads on the lines of the grid itself, but I need them to appear in between the two lines (see picture 2, from Lachenmann’s third string quartet). This would take a lot of work to add manually using symbols, so I’m looking for a way to input them as if they were written on a normal five-line staff in order to easily toggle them using the up and down arrow keys. Is something like this possible using the percussion grid? And if not, is it possible to use a normal five-line staff and hide the three middle lines so that only the two outer lines remain?
Go to Library > Instruments. Find the entry for Violin, and press the New Variant From Selection button.
In the “Variant name” field, call it “1-line” or something similar. Scroll down to the Staves and Clefs section, and change “Number of staff lines” to 1.
(Alternatively, looking at @jesele’s image, click the New Instrument from Selection button and call the instrument “Left Hand Finger”.)
Once you have created this instrument, you can add it to your player from the instrument picker.