Seeking pointers for coding with Mac::Sound or other Perl packages

Greetings and best wishes.
I am working on an experimental/recreational VoIP app using Net::SIP. All of the SIP stuff is easy and I am sending/receiving calls to/from my VoIP provider, no problem. I am to the point where I want to hook in live input from the system mic and/or play output directly to the speaker. I am i need of some pointers to get started. Currently I am using VLC to speaker the output and have no Mic input.
I have Mac::Sound (and the full Mac::Carbon) loaded, but I seem to be having trouble tracking down simple doc and examples. I can play an example sound file (Scream.rsrc) using SndPlay(0, $snd, 0), but I don't know the format of the resource file. And really, I don't want to play files, I want to stream my output (ULAW or decoded ULAW) to the speaker, and send the live Mic input to the call. Can anyone help me with some pointers to get started?
Ultimately, I will want to use a USB headset rather than the onboard mic and speaker.
Thanks.

Thanks for the advice about the obsolete status of Carbon (and perl Mac::Carbon). However I don't see any perl packages to interface to Core Audio. As I am experimenting, and as Carbon seems to work great on my 10.4.11 iMac, here is what I have done. To play an 8000 khz Ulaw clip held in some scalar, the following simple fragment will suffice:
use Mac::Memory;
use Mac::Sound;
my $ULAWCOMPHDRSIZE = 84;
my $RATE8KHZ = 8000;
my $MONO = 1;
my $BITS8PERSAMPLE = 8;
my $snd = <some ulaw encoded sound data>;
$hand = NewHandle($ULAWCOMPHDRSIZE);#setup won't grow handle size so don't $h = new Handle
Mac::Sound::SetupSndHeader($hand, $MONO, $RATE8KHZ, $BITS8PERSAMPLE,
kULawCompression, kMiddleC, length($snd));
$hand->append($snd); # the Handle methods all take care of size and resize for you
SndPlay($chan, $hand, 0); # sync play
You can async the play ( SndPlay($chan, $hand, 1) ) just fine, but unfortunately, the callback functionality is not supported. But as I am streaming well timed RTP buffers, I can handle the async complications in other ways.
I haven't started on recording from the MIC yet, but I expect it can be accomplished similarly.
Thanks.

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Digital tv media player (NBOX V3) - NTFS, FAT32/MSDOS
Mac - HFS+, exFAT (formatted on a PC best), FAT32/MSDOS
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