The 7sus4 chord is based on the 1st (Root) - 4th - 5th & b7th notes of a major scale. Inversions change the order of the notes by playing a different note as the lowest note of the chord. The chord symbols are written using a slash (/) such as C7sus4/F which means to play a C7sus4 chord with the F note as the lowest note in the chord. These chord symbols are common to other instruments such as keyboards.
