Cuckoo calls, due to their low frequency, do not seem to get picked up by Old Bird's Thrush detector software. I use Ravenlite to search a sound file for cuckoo calls. See Finding Cuckoos Calls.
Swainson's Thrushes can also be heard
Yellow-billed Cuckoo call recorded 5-25-06 at 1:20 AM
Closer view of same call above
Yellow-billed Cuckoo recorded 5-26-06 at 1:42 AM