You are welcome. It seems that NWC's support for tempo and dynamic variations within repeated sections is spotty.
This clip will handle 2nd time only:!NoteWorthyComposerClip(2.0,Single)
|Instrument|Name:"Flute"|Patch:73|Trans:0|DynVel:10,30,45,60,75,92,108,127|Pos:14
|Tempo|Tempo:80|Pos:8
|Bar|Style:MasterRepeatOpen
|Text|Text:"2nd time accel."|Font:StaffItalic|Pos:-7
|Ending|Endings:2|Visibility:Never
|TempoVariance|Style:Accelerando|Pos:14|Visibility:Never
|Ending|Endings:1,2|Visibility:Never
|Note|Dur:4th|Pos:-3
|Note|Dur:4th|Pos:-3
|Note|Dur:4th|Pos:-3
|Note|Dur:4th|Pos:-3
|Bar|Style:MasterRepeatClose
|Tempo|Tempo:160|Pos:8
|Note|Dur:Whole|Pos:-3
|Dynamic|Style:p|Pos:-7
|Bar|Style:MasterRepeatOpen
|Text|Text:"2nd time cresc."|Font:StaffItalic|Pos:-7
|Ending|Endings:2|Visibility:Never
|DynamicVariance|Style:Crescendo|Pos:14|Visibility:Never
|Ending|Endings:1,2|Visibility:Never
|Note|Dur:4th|Pos:-3
|Note|Dur:4th|Pos:-3
|Note|Dur:4th|Pos:-3
|Note|Dur:4th|Pos:-3
|Bar|Style:MasterRepeatClose
|Dynamic|Style:ff|Pos:-8
|Note|Dur:Whole|Pos:-3
!NoteWorthyComposerClip-End
I suspect that on Coda and on D.S./D.C. would need similar hacking.