Old 05-28-2019, 09:51 AM   #1
frank10
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Default insert delay for realtime AV sync

Hi all,
I need to add a realtime audio delay and then output the audio to sync with a video signal in OBS and then send it through the HDMI out of the pc.

Can this be done with Reaper?
TIA
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Old 05-29-2019, 04:19 AM   #2
frank10
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I just found a prog "VB-audio" that creates virtual input/output to connect Reaper with OBS.
So I only need Reaper or a VST plugin to add a delay to the incoming audio, let's say about +450ms ...
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Old 05-29-2019, 04:58 AM   #3
mschnell
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There are lots of plugins that provide a delay. E.g. ReaDelay comes with Reaper.

-Michael
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Old 05-29-2019, 06:29 AM   #4
frank10
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Maybe there is a misunderstanding on the term "delay". I don't want to add a delay to obtain some echo effect like ReaDelay does.
The "delay" I want is more a time alignment thing: i.e. 1500ms of delay: I say "One" on a mic and instead of immediately hearing "One" on the output, I want a silence of 1500 ms and then I can hear the non-processed sound "One"...
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Old 05-29-2019, 06:39 AM   #5
BobF
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This works really well

https://www.voxengo.com/product/sounddelay/
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Old 05-29-2019, 07:05 AM   #6
frank10
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Thank you.
Good, but it seems not perfect for this use: for example if I put an extreme value like 2000ms, just to detect well the delay, and say one only word, I get the initial 2s silence followed by the word, BUT after another 2s I can hear at a very low volume, another instance of the word... like an echo.

What I want is only a retard of the sound, like a buffer of the input sound delayed on time to be heared then unaltered. One program that do this, but not precisely on ms only fractions of seconds, is "radio delay": https://www.daansystems.com/radiodelay/

I would like the same result with ms on Reaper.
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Old 05-29-2019, 12:28 PM   #7
mschnell
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Quote:
Originally Posted by frank10 View Post
Maybe there is a misunderstanding on the term "delay".
ReaDelay with feedback and dry = 0 does exactly this.

But there are several delay JSFX plugins as well. maybe in the stock collection but definitively in ReaPack.

-Michael
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Old 05-30-2019, 07:40 AM   #8
frank10
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I'm no audio expert, I'm trying this but not getting the result...
My config:

x32 connected with USB, in mode 2/2 this Routing:
Input: Aux 1-2 = Card1-2
CardOut: P16 1-8
P16: 02 = DirOut ch1 prefader
My Mic on ch1


In Reaper:
I have a track with Input mono from ch2, EDIT Record: Output, Monitor:Input.
Then I press Fx button and add FX ReaDelay and set it:
Wet=0 ,Feedback=0 and Length (time) = 2000ms
Well, the audio in earphones is realtime without delay from mic and after 2s I hear also the same audio echoed plus at infinite the same sound reapeating...

So, total fail...
Please, tell me what I make wrong.

Last edited by frank10; 05-30-2019 at 07:48 AM.
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Old 05-30-2019, 07:57 AM   #9
frank10
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Instead I solved with Voxengo, thank you Bobf!
The low volume sound delayed I previously heard was the delayed sound on my earphones near to the mic, captured by the mic and re-delayed...
You can't monitor this thing, you set it and it will work, period.

I'm still curious on ReaDelay...
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Old 06-11-2019, 09:37 AM   #10
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Gotta be careful with numbers. In ReaDelay, a gain slider displaying 0 means 0db means unity gain. You want Dry and Feedback set to “-inf”. Then it should do exactly what you want.
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Old 06-11-2019, 02:07 PM   #11
mschnell
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Supposedly ReaPack -> Dual Time adjustment +/- delay is most exactly controllable: just type the numbers in msecs or samples (and view in meters)
-Michael
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Old 06-12-2019, 07:15 AM   #12
frank10
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Thank you, I missed that!
I had to put both at -inf and now it works!
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