Mixxx

  1. Bug #785939
  2. Comment #14

Comment 14 for bug 785939

Revision history for this message
Alan Millard (millard-alan) wrote : Re: Support Rane Serato TTM57SL Mixer

I just tried running Serato in Wine, but unfortunately it's unable to communicate to the mixer over USB. I just get the message "Rane Hardware Disconnected". From a quick Google, this seems to be a common problem, I don't think anyone has managed to get Serato working with Wine.

I also tried what you suggested Owen - setting up the mixer with Serato, leaving the mixer on, then disconnecting the USB cable and plugging it into a Linux machine. This doesn't work either - Mixxx still needs me to change the mixer input to the analogue signal from the turntable, so that the control signal gets output over USB. I guess this means that the initial USB communication with Serato isn't enough to persistently configure the mixer? When I'm using Serato, I have the mixer input set to the digital signal coming back from Serato, and somehow the analogue signal from the turntable is being routed through to Serato over USB behind the scenes.

I've found some better software called HDD Software USB Monitor (http://www.hhdsoftware.com/usb-monitor), so I might be able to get more information about the USB traffic, if someone can tell me what I should be looking for. There's a constant stream of packets to/from the mixer after the initial handshake, of types:

URB_FUNCTION_GET_CURRENT_FRAME_NUMBER
URB_FUNCTION_ISOCH_TRANSFER
URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER

I've tried filtering these out, and then playing around with the checkboxes in Serato, and there doesn't seem to be any USB packets of types other than these being sent when I do it. This means that either there is no communication between Serato and the mixer when you tick the checkboxes, or that it uses one of the above packet types that I've filtered out. Perhaps all of the mixer outputs are always available to Serato, and it just chooses which to use rather than instructing the mixer to provide a particular output?

Maybe this is a fundamental problem at the ALSA driver level? If I run "alsamixer" and select the TTM57SL as the sound card, it just says "This sound device does not have any controls."