Found the following hamletworks.org entries referring to line 3256-7

View Commentary Note for 3256-57
{M2v/3255+1} {Enter Hamlet and Horatio.} 
3256-7 Ham. Has this fellowe no feeling of his busines? <that>| {a} <he> sings {in} <at> graue- 
3257 making.5.1.66

View Material Textual Note for 3256-57
{M2v/3255+1} {Enter Hamlet and Horatio.} 
3256-7 Ham. Has this fellowe no feeling of his busines? <that>| {a} <he> sings {in} <at> graue- 
3257 making.5.1.66