I’m frustrated

M-Track Quad Popping and Audio Cutting Out

Every so often my M-Track Quad will "pop" in and out of audio playback. This causes Logic Pro X to give me the error message: "Unable to sync audio and midi".

This usually happens when the interface has been left on while the computer sleeps, but it also happens randomly. Most times, it works for me to uninstall the driver and re-install it. But, sometimes I have to do that up to three times before the interface works again.

I'm using a late-2013, 27-inch iMac running Yosemite 10.10.2 (I know there isn't a driver for that yet), 16 GB ram, and 3.2 GHz intel core i5. I use Logic Pro X and keep it up to date. Mostly midi signals pass in through the interface playing sampled software instruments, but sometimes instruments and mics as well.

Have you ever run into this problem?
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  • Hello Oliver,

    Thanks for posting. Happy to help!

    You'll definitely want to disable all Energy Saver settings in the Mac's System Preferences. When the computer goes to sleep or "rests" the hard drives, it can interrupt or simply shut down communication to peripherals through USB/FireWire/Thunderbolt ports.

    When it's woken back up, often any devices that use specialized drivers (audio interfaces like the M-Track Quad) will not be re-detected. I think this is a side effect of how the computer scans ports, but I'm not sure.

    Most computer developers leave this type of setting on by default because it doesn't affect most users who are simply connecting hard drives, printers, etc... Audio and video devices that are constantly working to stream multiple channels of data back and forth are another story, though.

    Anything else that can interrupt the USB signal or increases used bandwidth can be a factor too. If you're connecting the M-Track Quad through a USB hub or adapter, that is highly likely one of the causes.
    Another possibility is if you're loading up the USB ports on the rear of the M-Track Quad. There may be extra ports available there, but that does not mean that the USB port on the Mac itself has any more bandwidth.
    If you're running a hard drive or any other USB device that takes a lot of bandwidth into the rear hub of the M-Track Quad, you could be overloading the Mac's USB port.

    Hope this helps narrow things down a bit. Let me know!
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  • I’m happy
    Dan,

    I took a few days to try that out and so far it's worked seamlessly! Thanks for the help!
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  • Okay, this worked for a whole month which was great, but now I've got the same problem. Again, using Logic Pro X, seemingly at random the M-Track will "pop" and the audio will go out.

    Sometimes this lasts a few seconds before it comes back in, sometimes it seems to just turn off. There must be something wrong with the settings that I'm not aware of. Maybe sample rate? I use Logic at 44.1hz and I also use Adobe Premiere Pro at 48.0hz.

    Other than that, maybe it's the out-of-date driver?

    Thanks for your help again,
    Oliver
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  • I’m helpful
    I had a very similar issue with my M-Track Plus popping at any buffer length and cutting out for short bursts. I have resolved the issue by disabling my wireless network card. It seems the USB port my M-Track Plus uses shares an IRQ number with my wireless network card which causes the devices to compete and interrupt each other when communicating with the CPU. Give it a try, hope it helps.
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