Distorted audio playback with LP9 and Onyx 400F

Hi. I've got a new 21.5" iMac (intel) running 10.6.2 and I've been using an Onyx 400F and Logic Pro 9 with no problems until this afternoon. I know that Mackie have discontinued support for the 400F (frankly I can't see the difference in support from when it wasn't discontinued...) and the last Mac drivers were for Tiger etc etc. However, without any "adjustments" I was just able to plug the Onyx into the Mac and it worked. However, when I came in this afternoon and woke the machine up, all the audio now plays back distorted. I've googled and not found any real answers. I've tried adjusting the buffer size up and down. If I drop it to 32 samples, I get (expected) glitching, but the distortion is still there. Once I raise it to 64, the glitching goes away, but the distortion stays. Taking it a step at a time all the way up to 1024, there's still distortion.
This was working fine last night. There's been no software updates applied. Nobody has installed any software of any kind, no system settings have been changed. I've power cycled the Mac and the Onyx. I've disconnected the firewire and reconnected it. Logic detects it fine in each case, but I can't get clean audio out of it anymore. I've tried switching sample rates and bit depths. I can't think of anything else and there's not much help out there in google land. Percussive maintenance is the next step...
If anyone has any ideas, it would be hugely appreciated.
Thanks,
Geoff.

Hi there,
I've been asking on various audio forums about whether the Mackie 400f works okay with Snow Leopard (seeing as the drivers are out-of-date).
At the moment I'm running the 400f with Windows XP, but I want to switch to Mac(Book Pro) and I don't want to downgrade the operating system. Have you properly fixed this distortion problem or is it a temporary fix? I've read about it elsewhere, and it worries me -- perhaps it would be better to swap the 400f now to a newer interface while it's still under warranty...
Thanks for any help!

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Audio playback is clipped and has low volume

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type hw
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-- mod edit: read the Forum Etiquette and only post thumbnails http://wiki.archlinux.org/index.php/For … s_and_Code [jwr] --
Last edited by voodur (2014-04-23 22:24:35)

emeres wrote:Does this behaviour continue with pulseaudio killed? Use alsa directly to narrow the problem down first.
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If by this you mean this, I went through that guide and it did not make any difference.
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Record something on each track/instrument.
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drag it to the timeline…
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Option "EnablePageFlip" "true"
Option "AGPMode" "8"
Option "AGPFastWrite" "false"
Option "BusType" "AGP"
Option "DisplayPriority" "AUTO"
Option "IgnoreEDID" "false"
Option "RenderAccel" "true"
Option "AccelMethod" "EXA"
Option "AccelDFS" "true"
Option "FBTexPercent" "0"
Option "DMSForXv" "true"
Option "SubPixelOrder" "NONE"
Option "VGAAccess" "false"
Option "DRI" "true"
Option "XV_VSYNC" "true"
Option "XV_CRTC" "auto"
Option "XV_BICUBIC" "false"
EndSection
I'm glad with the video quality, however, I do experience little tearing sometimes, especially in the scenes involving panning.
The XV_VSYNC option is supposed to eliminate tearing (due to the radeon manual), but it is ignored if KMS is enabled. Try disabling KMS if you don't mind some performance reduction. The Radeon driver generally has some annoying bugs and glitches in KMS mode.

Distorted audio playback with LP9 and Onyx 400F

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