Please see attached patch from Ed to use the new TieNumericTextBox in
appropriate places, that bit looks fine to me.
Where we are using the likes of
mGainT = S.Id(ID_GAIN_TEXT).AddTextBox(_("Noise re&duction
and then setting a validator on the control (which is what I did in
AutoDuck), wouldn't it be neater to add a 'AddNumericTextBox' or
'AddValidatedTextBox' function to ShuttleGuiBase?
If I don't hear back I guess we'll go with what we have.