There are SOME drivers (and PC's from all vendors) that do not have this capability. A different/updated sound driver MAY take care of the problem. You didn't list your PC specs but if you have a Dell you may be out of luck, we have found, on the Dell users forum that non-Dell drivers either do not work or do not work correctly.
Oh, can you tell me what sound driver would be good? I'm sorry I forgot to list my PC specs. I made this post late at night and I was tired/frustrated. Here they are:
Operating System
MS Windows 7 32-bit
CPU
Intel Pentium T4200 @ 2.00GHz 68 °C
Penryn 45nm Technology
RAM
3.0GB Dual-Channel DDR2 @ 398MHz (6-6-6-18)
Motherboard
Wistron 3612 (CPU)
Graphics
Generic PnP Monitor @ 1366x768
Mobile Intel(R) 45 Express Chipset Family (Microsoft Corporation - WDDM 1.1)
Mobile Intel(R) 45 Express Chipset Family (Microsoft Corporation - WDDM 1.1)
Hard Drives
313GB Seagate ST9320320AS ATA Device (SATA) 57 °C
Optical Drives
TSSTcorp CDDVDW TS-L633M ATA Device
EVY WLQJWPE7 SCSI CdRom Device
Audio
Conexant High Definition SmartAudio 221
Sound Cards
Conexant High Definition SmartAudio 221
High Definition Audio Device
USB Audio Device
Playback Device
Headset Earphone (Microsoft LifeChat LX-3000 )
Recording Device
Headset Microphone (Microsoft LifeChat LX-3000 )