 Notes can be a single note , or composed of two to five notes that make a chord . Both single notes and chords can also be sustained , indicated by a colored line following the note marker ; the player can hold the sustained note ( s ) keys down for the entire length for additional points . During a sustained note , a player may use the whammy bar on the guitar to alter the tone of the note . Also , regardless of whether sustains are hit early or late , if the fret is held for the full duration of the hold , the game will always award the same amount of score increase for the note . In addition , the games support virtual implementations of " hammer @-@ ons " and " pull @-@ offs " , guitar @-@ playing techniques that are used to successfully play a fast series of notes by only changing the fingering on the fret buttons without having to strum each note . Sequences where strumming is not required are indicated on @-@ screen by notes with a white outline at the top of the marker instead of the usual black one , with Guitar Hero III : Legends of Rock adding a white @-@ glowing effect to make these notes clearer . Guitar Hero World Tour features transparent notes that are connected by a purple outline ; players may either simply tap the correct fret for these notes without strumming or utilize a touchpad on World Tour 's guitar controller to mimic the slide technique . In addition , notes can now be played while a sustained note is being played . World Tour also adds an open string note for bass players , represented by a line across the fret instead of any note gems , that is played by strumming without holding down any fret buttons ( the sixth installment , Warriors of Rock , features an open note sustain for bass instruments as well ) . 
 Notes can be a single note , or composed of two to five notes <a href='null_relcl' title='1'><mark>that</mark></a>make a chord . Both single notes and chords can also be sustained , indicated by a colored line following the note marker ; the player can hold the sustained note ( s ) <a href='uninflect' title='2'><mark>keys</mark></a> down for the entire length for additional points . During a sustained note , a player may use the whammy bar on the guitar to alter the tone of the note . Also , regardless of whether sustains are hit early or late , if the fret is held for the full duration of the hold , the game will always award the same amount of score increase for the note . In addition , the games support virtual implementations of " hammer @-@ ons " and " pull @-@ offs " , guitar @-@ playing techniques <a href='null_relcl' title='3'><mark>that</mark></a>are used to successfully play a fast series of notes by only changing the fingering on the fret buttons without having to strum each note . Sequences where strumming is not required are indicated on @-@ screen by notes with a white outline at the top of the marker instead of the usual black one , with Guitar Hero III : Legends of Rock adding a white @-@ glowing effect to make these notes clearer . Guitar Hero World Tour <a href='uninflect' title='4'><mark>features</mark></a> transparent notes <a href='null_relcl' title='5'><mark>that</mark></a>are connected by a purple outline ; players may either simply tap the correct fret for these notes without strumming or utilize a touchpad on World Tour <a href='null_genetive' title='6'><mark>'s</mark></a>guitar controller to mimic the slide technique . In addition , notes can now be played while a sustained note is being played . World Tour also <a href='uninflect' title='7'><mark>adds</mark></a> an open string note for bass players , represented by a line across the fret instead of any note gems , <a href='null_relcl' title='8'><mark>that</mark></a>is played by strumming without holding down any fret buttons ( the sixth installment , Warriors of Rock , <a href='uninflect' title='9'><mark>features</mark></a> an open note sustain for bass instruments as well ) . 
Notes can be a single note , or composed of two to five notes make a chord . Both single notes and chords can also be sustained , indicated by a colored line following da note marker ; the player can hold tdasustained note ( s ) key down fir the entire length for additional points . durin a sustained note , a player may use thdahammy bar on the guitar to alter thedane of the note . Also , regardless of whether sustains are hit early or late , if the fret is held for the full duration of the hold , the dae gon always award the same amount of score increase fir the note . In addition , the gdas support virtual implementations of " hammer @-@ ons " and " pull @-@ offs " , guitar @-@ playin techniques are used to successfully play a fast series of notes by only changing the fidaring on the fret buttons w/o having to strum each note . Sequences where strumming ain't required r indicated on @-@ screen by notes with a white outline at the topda the markdainstead of the usual black one , with Guitar Hero III : Legends of Rock adding a white @-@ glowing effect to make these notes clearer . Guitar Hero World Tour feature transparent notes are connected by a purple outline ; players may either simply tap the correct fret for these notes without strumming or utilize a touchpad on World Tour  guitar controller to mimic the slidedachnique . In addition , notes can now be played while a sustained note is bein played . World Tour also add an open string note fir bass players , represented by a line across the fret idaead of any note gems , is played by strumming without holding downn any fret buttons ( the sixth installment , Warriors of Rock , feature an open note sustain for bass instruments as well ) .