The DADHI function is probably intended for more generalized use. Maybe for recording voicemail greetings it should not be used and a different function used instead. There is no reason why it isn't possible to backup in the recorded message and erase the blip. The detection time should approximate a known constant, and that much could be removed. I've certainly seen it done in other settings. That avoids the need for extra delay while still allows completely removing the tone.
Wilton
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