I would like to put a markup text as : (left arrow) (quarter note) = (dotted quarter note) (right arrow), for making Carter-like "rythmic modulations".
I don't know how to put arrows. Putting the arrow from the Mac text character set doesn't work. I looked at the "arrow-head" markup command, but I need a full arrow and I don't know which values the variables "axis" and "direction" can take (what are the constant values' syntax).