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[dmitchell]

Has anyone else noticed distortion when using WASAPI? I have experienced it on two of my systems, on both Win 7 and Win 8, both regular WASAPI (push?) and event-mode.

If I change the output format from WASAPI to either DS or Kernel Streaming, and turn the volume on my soundcard down to around 85%, the distortion goes away.

As mentioned, this occurs on both my desktop system - using a USB headphone amp, as well as my 2 channel "reference" system at home (optical connection from soundcard into a high-end DAC).

Thanks.

[JimH]

Are you using build 106?  It's at the top of this board.

[dmitchell]

I don't think it's specific to a particular build. I notice it in both 104 (at home) and 106 (at work). For what it's worth, I don't think it's a MC issue, either, I think it's actually WASAPI, because I've noticed the same issue with Foobar.

[JimH]

What type of files are you playing?

[dmitchell]

flac and wav. Happens with both formats.

[Matt]

Clipping or distortion should not occur at 100%.  Do you have any DSP enabled?

You can use 'Audio Path' to check:
http://wiki.jriver.com/index.php/Audio_Path

[dmitchell]

Nope, no DSP enabled, and the audio path tells me there are no changes being made. I agree, there should be no distortion even at 100%, but alas, it is there.

[Matt]

I would take a close look at the audio hardware.

This statement makes me wonder if it's related to WASAPI at all:

If I change the output format from WASAPI to either DS or Kernel Streaming, and turn the volume on my soundcard down to around 85%, the distortion goes away.

I mean, use 'Internal Volume' and turn the volume down and it might remove the clipping just the same.