Is this the macro:
/castsequence reset=combat tremor totem , , ,
/castsequence reset=combat , tremor totem, ,
/castsequence reset=combat , , tremor totem,
/casysequence reset=combat , , , tremor totem

or this?

(Toon 1)
#Showtooltip Tremor Totem
/castsequence reset=15 tremor totem,,,

(Toon 2)
#showtooltip Tremor Totem
/castsequence reset=15 ,tremor totem,,

(Toon 3)
#showtooltip Tremor Totem
/castsequence reset=15 ,,tremor totem,

(Toon 4)
#showtooltip Tremor Totem
/castsequence reset=15 ,,,tremor totem