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I have this physical connection:

               "line in"
Mike -------------------> Computer

And I was using Windows 7 with the following settings:

Playback devices --> Recording --> Line In --> Properties --> "Listen to this device" is UNCHECKED

Playback devices --> Playback --> Speakers --> Properties --> Line In: 100% (un-muted)

Those settings work awesome: I get 0 delay.
If I use the "Listen to this device" option instead, I get a delay of ~1000ms (horrible)


With that said, I wanted to put real time effects to the "Line-In", so I downloaded VSTHost and used this settings:

Windows settings:
-----------------

"Listen to this device" continues UNCHECKED

Playback devices --> Playback --> Speakers --> Properties --> Line In: now is muted


VSTHost settings:
-----------------

Devices > Wave devices > 
                          Input port: DS Line in
                          Output port: MME Microsoft Sound Mapper

But then I got the same delay as the one with "listen to this device" checked

Question: What am I doing wrong? how can I achieve the same zero delay but with VSTHost instead of Windows?

1 Answer 1

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At the end it helped me to use a low buffer (a small number of samples)

   Select wave devices
   -------------------------------------------
   Input port: (whatever that works)
   Output port: (whatever that works)
   Sample rate: default
   Buffer: THIS IS THE KEY PARAMETER!...
           the lower the number of samples (or higher b/s), the lower is the latency
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  • which value did you end up using? Also: when using DS for output, the delay becomes extreme. Can you reproduce? Thanks!
    – qubodup
    Jul 1, 2016 at 11:08

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