Question regarding Palm Muting

I am working on a blues song that utilizes finger-picking. The first part is a melodic part played over a palm-muted drone bass note. I have entered the melodic notes as voice one and the bass notes as voice two. The issue is that when I mark the bass notes as palm-muted it also mutes the melodic notes in voice one. I know that I can create each part on a separate staff so that it plays back correctly, but I would like to use a single staff so that I can create tablature. Does anyone know how to accomplish this with Notion 4?