Recovery Delay: The delay setting is set to anywhere from 40 to 110 with 40 being used for a really trashy area and 110 for very little trash. Usually start off around 65 to 85 and adjust from that point for the amount of trash in the ground. A longer delay setting will give the deeper targets a longer sound but it will make them easier to hear. The recovery delay is for the disc mode only. Recovery delay does pretty much what is being heard except as the signal received from the target decays on its slope if a stronger signalis received before the end of the original target signal, the stronger signal will take over and sound off. This would be for all targets regardless of being a higher conductive target or a lower conductor target. If the new target/signal goes above the signal threshold of the older target/signal, then the new one will respond before the old signal is finished. The down side is if then new signal is weaker than the one being processed it will not be heard until the recovery delay is finish or until a stronger signal is detected.
This info comes from bob@ whites
hope it helps you!