All in-world and interface sounds play around 30 seconds after they're triggered. This happens right out of the box in a fresh install. I don't have this problem with an unaltered R7 installation, nor the latest Linden Lab and Firestorm viewers.
In Firestorm and LL the OpenAL line in the startup script is commented out. I tried commenting it out and it cut the delay down by maybe half, but its still a tremendous sound delay.
I'm running Linux Mint 13 64-bit.
Catznip R8 Jun 10 2013 17:56:29 (Catznip Release)
You are at 247183.0, 233374.0, 24.9 in ******* located at sim****.agni.lindenlab.com (**)
Second Life Server 13.05.31.276748
CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 6000+ (3000 MHz)
Memory: 3954 MB
OS Version: Linux 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GTS 250/PCIe/SSE2
OpenGL Version: 3.3.0 NVIDIA 304.88
RestrainedLove API: RLV v2.7.0 / RLVa v1.4.8a
libcurl Version: libcurl/7.21.1 OpenSSL/1.0.0d zlib/1.2.5 c-ares/1.7.1
J2C Decoder Version: OpenJPEG: 1.4.0, Runtime: 1.4.0
Audio Driver Version: FMOD version 3.750000
Qt Webkit Version: 4.7.1 (version number hard-coded)
Voice Server Version: Not Connected
Built with GCC version 40405
Packets Lost: 157/2640 (5.9%)