Sure. The default script does it with different sounds. Those sounds change in pitch. If you look in the default script, you'll see a series of if/then statements:
Code:
If BestSNR >= 60 Then
PlaySound "ns-signal-6.WAV"
ElseIf BestSNR >= 50 Then
PlaySound "ns-signal-5.WAV"
ElseIf BestSNR >= 40 Then
PlaySound "ns-signal-4.WAV"
ElseIf BestSNR >= 30 Then
PlaySound "ns-signal-3.WAV"
ElseIf BestSNR >= 20 Then
PlaySound "ns-signal-2.WAV"
ElseIf BestSNR >= 10 Then
PlaySound "ns-signal-1.WAV"
Else
PlaySound "ns-signal-0.WAV"
Do do what you want you'd have to:
1) Change all the sounds to the same file.
2) Insert an increasing time delay of some type at each if/then.
An alternative is to just use the default script. Just replace the sound files with a new ones. Each would be a beep followed increasing amounts of silence after the beep.
It just depends on what's easier for you: Programming or recording sounds. Being a true geek, I'd do the programming.