e.Blue
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Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
I've recently added a second audio interface to my main rig (UAD Apollo Twin USB). It appears that the only way to get multiple audio interfaces to work within the same SONAR session is to use WDM/KS mode instead of ASIO. However, while everything seems to be working OK, I have encountered this really weird side-effect. Whenever I press Play, it now takes over 2 seconds before playback begins. This doesn't appear to be a latency issue. Once playback actually starts, I can record audio and MIDI just fine with better than acceptable latency. I have already tried the following: - Creating a blank session with no plugins
- Turning Off/On 'Open all devices'
Changing the 'Open All devices' setting seems to improve the delay from 4 seconds to around 2 secs, but it still is a ridiculous amount of time. Any suggestions appreciated... -e.B
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brundlefly
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Re: Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
2016/11/30 14:29:21
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☼ Best Answerby e.Blue 2016/12/01 10:45:33
Disable Dynamic Arming? (Preferences > Project > Record > Allow Arm Changes During Playback/Record)
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JayCee99
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Re: Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
2016/11/30 14:35:31
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I think the November update has a bunch of improvements for drivers, including WASAPI improvements. You might want to try that?
My guess regarding the delay is that it's probably writing a bunch of data into the buffer before it starts playing. Doing a quick search, it looks like WDM drivers were created back in 2000 for 32-bit systems, and was mainly designed for CD-ROMs and stuff like that. Anyway, WDM drivers have always had crappy real-time performance on my system so I avoid them.
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THambrecht
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Re: Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
2016/11/30 16:34:36
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2 AudioInterfaces is "always" a huge problem. Not only with Sonar.
The Audio program must control two different drivers und must synchronize them.
I would avoid this in any case.
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gcolbert
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Re: Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
2016/11/30 19:33:51
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THambrecht
The Audio program must control two different drivers und must synchronize them.
I would avoid this in any case.
Unless the two interfaces have an external clock
Platinum / VS-100 / 12 GB RAM / Win 10 Pro / AMD A8 / MP Touch MonitorsPlatinum / on-board audio / 4 GB RAM /Win 10 Pro / HP dm4 Laptop / stuffTHpfft!
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Cactus Music
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Re: Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
2016/11/30 21:02:15
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My loopback tests of a few interfaces always showed that WDM mode was out of sync. 
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e.Blue
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Re: Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
2016/12/01 10:37:07
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brundlefly
Disable Dynamic Arming? (Preferences > Project > Record > Allow Arm Changes During Playback/Record)
This change made a HUGE difference. Now the delay is well below 1 sec, probably closer to 500ms or so. While not ideal, it is now much more acceptable. Thanks! -e.B
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e.Blue
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Re: Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
2016/12/01 10:41:24
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THambrecht
2 AudioInterfaces is "always" a huge problem. Not only with Sonar.
The Audio program must control two different drivers und must synchronize them.
I would avoid this in any case.
Actually, other than the aforementioned playback start delay, the two interfaces are working remarkable well together. I'm now running at 4ms latency with reduced CPU load, which is better than ASIO on the same interface (VS700). -e.B
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e.Blue
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Re: Switched from ASIO to WDM/KS...pressing Play now has 2-4sec delay
2016/12/01 10:44:53
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gcolbert
THambrecht
The Audio program must control two different drivers und must synchronize them.
I would avoid this in any case.
Unless the two interfaces have an external clock
I using sync via the ADAT Out of the VS700 into the ADAT In on the Apollo Twin USB. While it can sometimes be tricky getting the Apollo to 'sync up' initially, once they do, things become rock solid.
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