G'day Peter,
With respect mate, please consider the following example:
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|Instrument|Name:"Trumpet"|Patch:56|Bank:0,0|Trans:0|DynVel:10,30,45,60,75,92,108,127|Pos:9|Wide:Y
|Note|Dur:8th,Grace|Pos:#0^|Visibility:Never
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:2
|Bar
|Note|Dur:8th,Grace|Pos:#0|Opts:Muted|Visibility:Never
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:2
|Bar
|Note|Dur:4th|Pos:#0
|Note|Dur:4th|Pos:2
|Bar
|Note|Dur:8th,Grace|Pos:#0^|Visibility:Never
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:2
!NoteWorthyComposerClip-End
You will note that in bars 1 and 4 the first note holds longer than the second note... Bars 2 and 3 are identical and "correct" IMHO