The audio input and output of this USB soundcard works well, but I could not make much sense of the hardware mixer.
The hardware is relatively simple: 2 stereo pairs in, 3 stereo pairs out (or 2 stereo pairs out when operating at 48kHz) for DJs.
The mixer presented by 'alsamixer' is not a good match for the hardware. I hoped to create a mapping to fix this, but then it was more difficult because it seems that the mixer controls behave inconsistently. For example, to mute the monitoring of inputs 1-4 one must use:
$ amixer cset numid=4 off,off $ amixer cset numid=5 off $ amixer cset numid=4 on,on
This, on its own, does not work:
$ amixer cset numid=5
It was trial-and-error which got me to this conclusion.
Is this common behaviour for a USB device like this, and can I map around it? Or does it mean the hardware is buggy?
The mixer presented by the Windows software is nothing special, with normal controls (see http://www.pogo.org.uk/~mark/tmp/u46.png), and it behaves consistently. So it is possible.
How can I get this device to sensible mixer controls? Thanks!
$ amixer -c 1 contents numid=1,iface=MIXER,name='U46DJ Capture Switch' ; type=BOOLEAN,access=rw------,values=2 : values=on,on numid=2,iface=MIXER,name='U46DJ Capture Switch',index=1 ; type=BOOLEAN,access=rw------,values=1 : values=on numid=3,iface=MIXER,name='U46DJ Capture Volume' ; type=INTEGER,access=rw---R--,values=4,min=0,max=15,step=0 : values=0,0,0,0 | dBminmax-min=0.00dB,max=22.50dB numid=4,iface=MIXER,name='U46DJ Playback Switch' ; type=BOOLEAN,access=rw------,values=2 : values=on,on numid=5,iface=MIXER,name='U46DJ Playback Switch',index=1 ; type=BOOLEAN,access=rw------,values=1 : values=on numid=7,iface=MIXER,name='U46DJ Playback Switch',index=2 ; type=BOOLEAN,access=rw------,values=4 : values=on,on,on,on numid=8,iface=MIXER,name='U46DJ Playback Switch',index=3 ; type=BOOLEAN,access=rw------,values=1 : values=on numid=6,iface=MIXER,name='U46DJ Playback Volume' ; type=INTEGER,access=rw---R--,values=4,min=0,max=31,step=0 : values=23,23,23,23 | dBminmax-min=-34.50dB,max=12.00dB numid=9,iface=MIXER,name='U46DJ Playback Volume',index=1 ; type=INTEGER,access=rw---R--,values=6,min=0,max=31,step=0 : values=31,31,31,31,31,31 | dBminmax-min=-46.50dB,max=0.00dB
$ lsusb -v -d 0a92:00e1
Bus 003 Device 009: ID 0a92:00e1 EGO SYStems, Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.01 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x0a92 EGO SYStems, Inc. idProduct 0x00e1 bcdDevice 1.00 iManufacturer 1 ESI iProduct 2 U46DJ iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 264 bNumInterfaces 4 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 0 iInterface 2 U46DJ AudioControl Interface Descriptor: bLength 10 bDescriptorType 36 bDescriptorSubtype 1 (HEADER) bcdADC 1.00 wTotalLength 117 bInCollection 2 baInterfaceNr( 0) 2 baInterfaceNr( 1) 1 AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 4 wTerminalType 0x0201 Microphone bAssocTerminal 6 bNrChannels 4 wChannelConfig 0x000f Left Front (L) Right Front (R) Center Front (C) Low Freqency Enhancement (LFE) iChannelNames 0 iTerminal 2 U46DJ AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 5 bSourceID 7 bControlSize 1 bmaControls( 0) 0x01 Mute bmaControls( 1) 0x03 Mute Volume bmaControls( 2) 0x02 Volume bmaControls( 3) 0x03 Mute Volume bmaControls( 4) 0x02 Volume iFeature 2 U46DJ AudioControl Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 5 (SELECTOR_UNIT) bUnitID 7 bNrInPins 1 baSource( 0) 4 iSelector 2 U46DJ AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 6 wTerminalType 0x0101 USB Streaming bAssocTerminal 4 bSourceID 5 iTerminal 2 U46DJ AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 1 wTerminalType 0x0101 USB Streaming bAssocTerminal 3 bNrChannels 6 wChannelConfig 0x003f Left Front (L) Right Front (R) Center Front (C) Low Freqency Enhancement (LFE) Left Surround (LS) Right Surround (RS) iChannelNames 0 iTerminal 2 U46DJ AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 8 bSourceID 4 bControlSize 1 bmaControls( 0) 0x01 Mute bmaControls( 1) 0x03 Mute Volume bmaControls( 2) 0x02 Volume bmaControls( 3) 0x03 Mute Volume bmaControls( 4) 0x02 Volume iFeature 2 U46DJ AudioControl Interface Descriptor: bLength 20 bDescriptorType 36 bDescriptorSubtype 4 (MIXER_UNIT) bUnitID 9 bNrInPins 2 baSourceID( 0) 8 baSourceID( 1) 1 bNrChannels 6 wChannelConfig 0x003f Left Front (L) Right Front (R) Center Front (C) Low Freqency Enhancement (LFE) Left Surround (LS) Right Surround (RS) iChannelNames 0 bmControls 0x00 bmControls 0x00 iMixer 0 junk at descriptor end: 00 00 00 00 00 02 AudioControl Interface Descriptor: bLength 14 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 2 bSourceID 9 bControlSize 1 bmaControls( 0) 0x01 Mute bmaControls( 1) 0x03 Mute Volume bmaControls( 2) 0x02 Volume bmaControls( 3) 0x03 Mute Volume bmaControls( 4) 0x02 Volume bmaControls( 5) 0x03 Mute Volume bmaControls( 6) 0x03 Mute Volume iFeature 2 U46DJ AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 3 wTerminalType 0x0301 Speaker bAssocTerminal 1 bSourceID 2 iTerminal 2 U46DJ Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 2 U46DJ Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 2 U46DJ AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 1 bDelay 1 frames wFormatTag 1 PCM AudioStreaming Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 6 bSubframeSize 2 bBitResolution 16 bSamFreqType 1 Discrete tSamFreq[ 0] 44100 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 9 Transfer Type Isochronous Synch Type Adaptive Usage Type Data wMaxPacketSize 0x0220 1x 544 bytes bInterval 1 bRefresh 0 bSynchAddress 0 AudioControl Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x00 bLockDelayUnits 0 Undefined wLockDelay 0 Undefined Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 2 U46DJ Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 2 U46DJ AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 6 bDelay 1 frames wFormatTag 1 PCM AudioStreaming Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 4 bSubframeSize 2 bBitResolution 16 bSamFreqType 1 Discrete tSamFreq[ 0] 44100 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 13 Transfer Type Isochronous Synch Type Synchronous Usage Type Data wMaxPacketSize 0x01a0 1x 416 bytes bInterval 1 bRefresh 0 bSynchAddress 0 AudioControl Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x00 bLockDelayUnits 0 Undefined wLockDelay 0 Undefined Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 3 Human Interface Devices bInterfaceSubClass 0 No Subclass bInterfaceProtocol 0 None iInterface 2 U46DJ HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.00 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 52 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 0x0008 1x 8 bytes bInterval 20 Device Status: 0x0001 Self Powered