It seem bug of virtual box 5.0 in emulated three ac97 codecs on ich 80281ab controller which does not support multi channel /codecs
0-0/0: Analog Devices AD1980 PCI Subsys Vendor: 0x1028 PCI Subsys Device: 0x0177 Flags: 12 Revision : 0x00 Compat. Class : 0x00 Subsys. Vendor ID: 0x0000 Subsys. ID : 0x0000 Capabilities : -headphone out- DAC resolution : 16-bit ADC resolution : 16-bit 3D enhancement : No 3D Stereo Enhancement
0-0/1: Analog Devices AD1980 PCI Subsys Vendor: 0x1028 PCI Subsys Device: 0x0177 Flags: 12 Revision : 0x00 Compat. Class : 0x00 Subsys. Vendor ID: 0x0000 Subsys. ID : 0x0000 Capabilities : -headphone out- DAC resolution : 16-bit ADC resolution : 16-bit 3D enhancement : No 3D Stereo Enhancement
0-0/2: Analog Devices AD1980
It seem bug of virtual box 5.0 in emulated three ac97 codecs on ich 80281ab controller which does not support multi channel /codecs
0-0/0: Analog Devices AD1980 PCI Subsys Vendor: 0x1028 PCI Subsys Device: 0x0177 Flags: 12 Revision : 0x00 Compat. Class : 0x00 Subsys. Vendor ID: 0x0000 Subsys. ID : 0x0000 Capabilities : -headphone out- DAC resolution : 16-bit ADC resolution : 16-bit 3D enhancement : No 3D Stereo Enhancement
0-0/1: Analog Devices AD1980 PCI Subsys Vendor: 0x1028 PCI Subsys Device: 0x0177 Flags: 12 Revision : 0x00 Compat. Class : 0x00 Subsys. Vendor ID: 0x0000 Subsys. ID : 0x0000 Capabilities : -headphone out- DAC resolution : 16-bit ADC resolution : 16-bit 3D enhancement : No 3D Stereo Enhancement
0-0/2: Analog Devices AD1980