I took a couple of images of the hardware and put them on PicasaWeb: https://picasaweb.google.com/111743287730172647732/MAudioTransitUSB.
The ICs used are:
- U1 TI TAS1020A (8052 w/USB audio streaming) Stereo USB Audio Interface
- U2 uC 24LC64 (serial EEPROM) 64 Kbit Electrically Erasable PROM
- U3 AKM AK4584VQ (audio) 24Bit 96kHz Audio CODEC with DIT/DIR
- U4 1117M3 Low Dropout (LDO) Regulator 800m
- U5 NS LMV722M (amp) 10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier
- U6 6333 ? Ultra-Low-Voltage, Low-Power µP Reset Circuit ?
madfuload is needed to inject the firmware.
sudo aptitude install madfuload
After madfuload has been installed and udev restarted, the following command should start a command line tool to adjust the volume for the Transit USB:
alsamixer -c 1
Setting up The Amarok Media Player to Use it as a Second Sound Card
Assuming you are using the xine engine with ALSA as its output plugin, there should be a section called "ALSA Device Configuration", which lets you set the output device depending on whether it's a mono, stereo, 4 or 6 channel device. As I have selected Stereo 2.1 in the Speaker Arrangement box below, and have 2 speakers and a subwoofer, the box that matters to me is the Stereo box.
By default the boxes contain:
- Mono: default
- Stereo: default
- 4 Channel: plug:surround40:0
- 6 Channel: plug:surround51:0
If I wanted to use my second sound card, I would change the
plughw:1,0 under Stereo.
- Previous German product site: http://www.m-audio.com/products/de_de/Transit.html
- Disabling M-Audio Transit USB Analog Input DC Bias
- DIY Workshop » Transit mod ideas
- Linux HowTo, Test and Review: http://www.theory.physics.ubc.ca/transit.html