Avast Sound?

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I'm using avast free just scanned a large file, and avast didn't detect anything, but i got a sound clip saying "file has been scanned" and some weird noise right after that i have never heard before. I scan my computer all the time, and I have been using avast for about 9ish months, and i've never heard this sound.
Is this normal and i've just never heard it, or did something modify my avast program?

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it says something along the lines of "scan is complete"

[Pondus]

I scan my computer all the time,...................

Why?  avast have realtime protection

[DavidR]

'Scan has been completed' is what I believe you have heard - See C:\ProgramData\AVAST Software\Avast\sounds\2057 for other sounds that you may encounter.

Double click the file to hear it.

- With a resident (on-access) scanner the need for on-demand scans is much depreciated. For the most part dormant/inert files are being scanned, the other active files are going to be scanned by the resident shields when they are activated.