I've just purchased an inexpensive USB cassette player in order to archive/preserve some audio cassette recordings of some interviews I did years ago, and I've run into a slight issue with the detection of the device. The device identifies as a JMTek USB Audio Device (Vendor 0c76, Device 160a). I'm using openSUSE 12.2. When I plug the device in and connect to it with Audacity, and I only get a mono channel (rather than a stereo setup). Looking at the output of "lsusb -v", I see that the input terminal is identified as a microphone with one channel. (Output of lsusb -v is at the end of this post) If I start a Windows XP VM in Virtualbox and connect the device to that, it is recognized (in Windows) as a stereo device, and I can record left and right channels, so the hardware should be recognized as having stereo channels via USB. There are no special drivers installed for the Windows VM (it was just "plug and play"). I'd much rather not have to boot up a Windows VM in order to record audio from this device. I also would prefer to not use line-in, as I almost always have ended up with a 60 cycle hum recording that way, and I don't get that if I record over the USB connection (the USB connection also powers the device). snd_usb_audio is automatically loading when I plug the device in. Are there any tricks that I might apply to getting this device recognized properly or to diagnose why it's being identified as a mono device? Thanks, Jim --- output of "lsusb -v" for this device --- Bus 003 Device 007: ID 0c76:160a JMTek, LLC. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x0c76 JMTek, LLC. idProduct 0x160a bcdDevice 1.00 iManufacturer 0 iProduct 1 USB Audio Device iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 156 bNumInterfaces 3 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 0 iInterface 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 1 (HEADER) bcdADC 1.00 wTotalLength 46 bInCollection 1 baInterfaceNr( 0) 1 AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 2 wTerminalType 0x0201 Microphone bAssocTerminal 0 bNrChannels 1 wChannelConfig 0x0001 Left Front (L) iChannelNames 0 iTerminal 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 18 wTerminalType 0x0101 USB Streaming bAssocTerminal 2 bSourceID 33 iTerminal 0 AudioControl Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 5 (SELECTOR_UNIT) bUnitID 33 bNrInPins 1 baSource( 0) 50 iSelector 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 50 bSourceID 2 bControlSize 1 bmaControls( 0) 0x43 Mute Control Volume Control Automatic Gain Control bmaControls( 1) 0x00 iFeature 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 18 bDelay 1 frames wFormatTag 1 PCM AudioStreaming Interface Descriptor: bLength 26 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 1 bSubframeSize 2 bBitResolution 16 bSamFreqType 6 Discrete tSamFreq[ 0] 48000 tSamFreq[ 1] 44100 tSamFreq[ 2] 32000 tSamFreq[ 3] 22050 tSamFreq[ 4] 11025 tSamFreq[ 5] 8000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0064 1x 100 bytes bInterval 1 bRefresh 0 bSynchAddress 0 AudioControl Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 0 Undefined wLockDelay 0 Undefined Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 0 No Subclass bInterfaceProtocol 0 None iInterface 0 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.00 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 50 Report Descriptors: ** UNAVAILABLE ** Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0004 1x 4 bytes bInterval 8 Device Status: 0x0000 (Bus Powered) --- snip --- -- Jim Henderson Please keep on-topic replies on the list so everyone benefits