I recorded USB signals with Wireshark with the Rane SL4 plugged into a Windows 7 VM. I recorded connecting the device, switching the passthroughs on/off with the driver's control panel program, flipping the hardware switches, and playing a track with Mixxx. If anyone is interested in using this to write a driver, respond off-list and I can send you the 19 MB archive of the USB signal logs.

On 03/24/2015 03:33 AM, Be wrote:

Hi, I recently published the first version of Crossfade GNU/Linux, a distro for DJing from USB drives on any PC (see http://mixxx.org/forums/viewtopic.php?f=1&t=7031 for details). I just tried it on my friend's Macbook which he uses with a Rane SL4 USB sound card. I realized there is no Linux driver for the current line of sound cards sold for digital vinyl emulation with Serato DJ. These are the Rane SL2, SL3, and SL4 (http://serato.com/hardware/all/mixers-interfaces ; the Denon DS1 was also recently announced but not available yet: http://serato.com/latest/blog/17973/announcing-denon-ds1 ). They range from 4 in/4 out to 10 in/10 out and all have phono preamps built in. There appears to be support for the old and discontinued Rane SL1, which used USB 1.1, but the SL2/3/4 use USB 2.0. Has anyone thought about writing a driver for these?