Type:     Bass Tab

Sorry John, but your tab was off by a fret. Move up a fret, like this:
    
    Riff 1 (played with there are no vocals):
    |-----------------|-----------------|-----------------|
    |-----------------|-----------------|-----------------|
    |-6-6-6-6-6-6-6-6-|-6-6-6-6-6-6-6-6-|-4-4-4-4-4-4-4-4-|
    |-----------------|-----------------|-----------------|
      1 & 2 & 3 & 4 &   1 & 2 & 3 & 4 &   1 & 2 & 3 & 4 &
    
    |-----------------|
    |-----------------|
    |-----------------|
    |-4-4-4-4-4-4-4-4-|
      1 & 2 & 3 & 4 &
    
    Riff 2 (played when there are vocals):
    |-----------------|-----------------|-----------------|
    |-----------------|-----------------|-----------------|
    |-6-6-6-6-6-6-6-6-|-6-6-6-6-6-6-6-6-|-4-4-4-4-4-4-4-4-|
    |-----------------|-----------------|-----------------|
      1 & 2 & 3 & 4 &   1 & 2 & 3 & 4 &   1 & 2 & 3 & 4 &
    
    |-----------------|
    |-----------------|
    |-3-3-3-3---------|
    |---------4-4-4-4-|
      1 & 2 & 3 & 4 &

- Teej -