hi 3v0,
Do you have a copy of the audio program named 'Audacity', its freeware.
You can record via mic/line inputs and manipulate the sounds.
A couple of years ago, the constant squawking of magpies was a constant nuisance.
I downloaded some magpie distress calls and mixed them with crow sounds.
Played the mix back thru a couple of high powered speakers, under the garden trees, for a few minutes,
that did the trick, they flew in all directions.
Only had to do it once since, it works.
EDIT: If you do dwnld Audacity, get the Lame MP3 Encoder at the same site.