Screen capture : problems with audio quality & volume

Hi all ,
I'm quite new with Arch (I installed it 1 week ago) but I'm a quite veteran debian user (since 10 years)...
I'd like to produce screencast for my students , so I 've made some tests with xvidcap & recordmydesktop, they were fine
I 've decided to add sound to these first demos and that 's here that difficulties come...
My laptop is a Sony VAIO VPC Z1 (quad core i7 , 8Gb of RAM , 500 gb harddisk, with an hybrid graphics card i915/Nvidia M 330)
Soundcard is well detected :
\ └─(\ 1:\ 10:03\ :%)─\ ─\  lspci|grep -i audio                                                            ──\ (lun.,nov.29)─┘
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
01:00.1 Audio device: nVidia Corporation High Definition Audio Controller (rev a1)
they are seen in the cards file:
\ └─(\ \ 10:10\ :%)─\ ─\  cat /proc/asound/cards                                                           ──\ (lun.,nov.29)─┘
0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xd7820000 irq 45
1 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xd1000000 irq 16
My problems are :
- it seems that my alsamixer are lost each time (preferences for each channel)
- I don't know what channel to use while recording because I've got :
record
record1
record2
digital
micro
micro boost
ouch...
I 've tried to make some sound  capture with a Plantronics (earphones + micro ) using my front connectors (2 jack )
Results are very confusing:
- with audacity , sound is quite good
- with recordmydesktop, noise leveel is very high, I can't figure out how to filter the signal
- with xvidcap ,the man page is not very informative for options to capture sound
So your feedbacks are welcome...
It's my first attempt to do multimedia with Linux (I use it for programming Java/C++ and for documents editing in LateX)
Thanks
jerome

It does appear to be a bit tricky to get the Mac to always recognize this key combination. Especially if Space has another function related to that window, such as Quick View over a Finder window. I could not get consistent results when using the key combo, sometimes it worked first time, many times nothing.
But there is another way to get screen shots. There is the Apple Utility Grab in the Utilities folder (Apps/Utilities). It will help you with all the screen shots the key combos take.
Dah•veed

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