Powerpoint VBA – Animate Text – Seconds delay between letters

I’m trying to set up an interactive sequence item that displays characters one letter at a time. The code below works well to achieve this, but does anyone know how to set “seconds delay between letters” (or words - or % delay between letters if another msoAnimEffect is chosen). I seem to be able to set every timing/animation feature except this one!!!

Any help would be very much apreciated.

Nige.

Sub aaa()

Dim ISEff As Effect

Dim MyWord As Shape

With ActivePresentation.Slides(2)

Set MyWord = .Shapes(1)

Set ISEff = .TimeLine.InteractiveSequences.Add _

.AddEffect(Shape:=.Shapes(2), effectId:=msoAnimEffectAppear, _

trigger:=msoAnimTriggerOnShapeClick)

ISEff.Timing.TriggerShape = MyWord

Set ISEff = .TimeLine.InteractiveSequences(1) _