I just recently installed Debian 7 Wheezy with KDE and once I turn on the computer, the start-up sound is garbled. The closest description I can think of is that the sound coming out is somehow overlapped with a "dial-up modem"-like sound (here's a sample of what a dial-up modem sounds like, in case you don't know or have forgotten).
What's curious is that once I change the volume two to three notches up using the global volume control (or even the VLC volume control), the sound somehow becomes fine. But when I pause a movie and resume play, the sound becomes garbled again and I need to re-adjust the volume just to make the sound fine again. I haven't encountered this issue with Ubuntu 12.04 LTS or Linux Mint 13 XFCE (I used these on this same computer before deciding to use Debian 7 Wheezy) as both these OSes handled sound just fine so it's really becoming frustrating.
lspci -k gives the ff. results w.r.t. audio devices:
00:01.1 Audio device: Advanced Micro Devices [AMD] nee ATI Trinity HDMI Audio Controller Subsystem: ASUSTeK Computer Inc. Device 8526 00:14.2 Audio device: Advanced Micro Devices [AMD] FCH Azalia Controller (rev 01) Subsystem: ASUSTeK Computer Inc. Device 841b Kernel driver in use: snd_hda_intel
I think I am using the second audio device because I don't have anything connected to the HDMI port. I'm also guessing that system uses pulseaudio server to handle the sound. Could the issue be caused by the kernel driver
snd_hda_intel since I am using an AMD chipset?
My computer has an AMD A10-5800K processor on an ASUS F2A85-V PRO motherboard, in case this info is useful in someway.