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In Reply to: USB Interfaces: Question on RCA Out vs. Digital Out posted by Xenithon on October 17, 2006 at 06:25:23:
There should be no pops and clicks.
Have you tried to increase playback buffer in foobar, to let's say 5 seconds?
Follow Ups:
Hi there. Yes, I have tried tweaking the playback buffer, both in foobar and in the Edirol control panel. As you can see in the image attached, the Edirol control panel has the buffer at one notch before max. I have also tried it at max and it even seemed a little worse. The image also shows the settings, which are left at default and are the recommended settings for ASIO.The Edirol is set to advanced mode (24-bit and using ASIO; non-advanced mode is 16-bit and does not use ASIO) and at 48kHz. I tried it up to 96kHz and while it sometimes sounded a little better (quality wise) there were more pops/clicks at that sample rate.
The foobar buffer I tried everything from around 500ms all the way to around 4000ms. Currently it is at 1500ms and there are still clicks/pops but only come about every 20-25 second. I would like to eliminate them completely however. I have not tried the buffer as high as 5s yet.
x,for some usb devices, using 'direct monitor' will add a lot of processing overhead for both the CPU and the USB bus.
try turning this option off since it can only improve sound quality to turn it off (it does not have any positive effect to have this turned on).
Hi there. Thanks for the tip, I will try it out. The reason I left it on as that according to the manual, it needs to be on in order for ASIO to work, otherwise IIRC it defaults to the WDM driver. I will double check though and let you know!
X - based on the numbers you are indicating for what you are setting for the buffer in foobar, it sounds like the DirectSound settings. Can you double check your Output option? You should be using ASIO, and for that you need an ASIO plugin for foobar. You can get the plugin for version 0.8.3 here:
http://personales.ya.com/angel49/foobar2000_otachan/Or for version 0.9.4 go here:
http://www.foobar2000.org/components/index.html(Forgive me if I'm overstating the obvious - and you are already aware of these things)
A couple of other things to note: Go to your "Core" preferences in foobar and change the process priority class to "realtime" (all the way to the right). Also, are you using SRC in foobar to upsample to 96KHz? If so, this requires substantial CPU processing.
Yeah, I'm sorry, I should have mentioned I'm only familiar with v0.8.3. Poor assumption on my part to think they were the same.Hopefully v0.9.4 users can chime in now and give useful advice.
BTW, this may be helpful to know - if you disable the resampling and just output 16/44.1 do the "pops/clicks" go away?
Xenithon - I thought of something else that may be pertinent.What format is the music you are playing? (WAV, FLAC, MP3)
Playing FLAC files, for example, require more CPU processing than WAV, and could result in "pops/clicks".
Hi there,ASIO is indeed installed and being used by foobar. The buffer setting for playback I mentioned is the only one in foobar (using 0.9.4). There are also thus no "Core" settings. I tried setting priority to realtime in task manager and it ends up causing the music to "slow down" for some reason.
In terms of upsampling, I am currently upssampling to 48kHz - seemed to be better than 96kHz in terms of performance. I have tried this with all 3 DSP plugins (standard foobar resampler, SRC and PPHS).
Sounds like you have a virus scanner running. You must turn this off. Also screen-saver, basically everything not needed. You MUST use the real-time priority setting in foobar or select it from task manager.
And Firewall too. They are even more intrusive than virus scanners. Possibly Norton is exception; this is very very intrusive.
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