InitializeSoundRec, FreeBufferForSoundRec, StartSoundRecord

InitializeSoundRec, FreeBufferForSoundRec, StartSoundRecord:
Could they be used just to create/record a sound (wav) file from a lua script?
Sometimes I do this with a small-low-res movie from chdk's menu, if I need to record voice...
But if those can create a wav/sound file from a lua script that would be cool.

This was discussed somewhat in the canon basic defcon presentation docs
http://corelabs.coresecurity.com/index.php?module=Wiki&action=attachment&type=publication&page=Exploiting_Digital_Cameras&file=Exploiting_Digital_Cameras_IOBasic_-_BONUS.pdf

See the "Examples section". If someone wants to work out the details, stand alone sound recording from script or chdk menus would be a great feature. Could presumably also do sound triggering like MD.

Note that the Factory mode event procedures should be treated with caution: http://chdk.setepontos.com/index.php?topic=4417.msg45029#msg45029

Your super A540 is dead?
I don't want to brick my beautiful A590IS
This summer the lens wouldn't come out (lens error)  and I was able to fix it, zoom arthritis?

Your super A540 is dead?

No, that's an old thread, if you read through, it was recovered and never actually dead. But it's not obvious how to do it, and some of the other factory mode functions change adjustment tables stored in ROM, so it's possible you could do things that hurt image quality.

I am very interested in an audio recorer function as the SX260HS lacks a recorder in the Canon firmware.
So where do I find code to test?

So where do I find code to test?

You won't find any.
The event procedures mentioned in the title are meant to be used for basic testing and not suitable for regular use. Sound quality is 11kHz/8bit/mono, memory is allocated from the regular AllocateMemory heap, header (like WAV) is not generated, saving to file is not implemented.
They might help the implementation of a real sound recorder, but that needs somebody who's interested and has the necessary reverse engineering and programming skills.