insert delay for realtime AV sync

[frank10]

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

[frank10]

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 ...

[mschnell]

There are lots of plugins that provide a delay. E.g. ReaDelay comes with Reaper.

-Michael

[frank10]

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"...

[BobF]

This works really well

https://www.voxengo.com/product/sounddelay/

[frank10]

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.

[mschnell]

Originally Posted by frank10

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

[frank10]

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.

[frank10]

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...

[ashcat_lt]

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.

[mschnell]

Supposedly ReaPack -> Dual Time adjustment +/- delay is most exactly controllable: just type the numbers in msecs or samples (and view in meters)
-Michael

[frank10]

Thank you, I missed that!
I had to put both at -inf and now it works!