It's the other way round, but David Wilcocks (and probably other choral conductors) always got his choir to voice their Ds as Ts, as it sounds more crisp.
Grunger, I'm perfectly happy with 'marinade' as a verb - because Chambers is perfectly happy with 'marinade' as a verb! The definition says ' to steep in a marinade (also marinate)'. And 'marinate' doesn't get a listing on its own, so I don't feel it's been usurped!
Malone
You have to remember that Chambers is descriptive, not prescriptive, so it includes all sorts of usages that are just plain wrong! I wish they were more ready to add "incorrect" or similar.
Thanks, ChrisE. I'd have been quite happy to correct Chambers if I'd thought it was necessary - but 'marinade' as a verb has been used since the late 17th century! That's from the Oxford Dictionary of English. The Shorter Oxford English Dictionary has 'marinade' as a verb first used 1700-1729.