It's kinda diffuclt, especielly when you trill with pulse. Put you can also trill like tremolo-picking. Just hammering and pull off as fast as you can hand keep the pulse by changing notes with your left hand (if you're right handed)



e|--------------------------|
B|--------------------------|
G|--------------------------|
D|--5tr7-7tr9-9tr10-10tr12--|
A|--------------------------|
E|--------------------------|