FLAG x Omri Cohen Prism of Perception (Advanced Delay + Looper)


Jonas here, I just released two modules for VCV Rack. This is a first for me in that they have been developed in collaboration with Omri Cohen.

The main features are:

  1. No clicks
  2. Freeze Buffer
  3. Reverse buffer
  4. Looper with scanning through the recorded buffer
  5. Ducking
  6. Karplus/Strong (accepts V/O)

Omri made a great Tutorial here:

Hope you like it!



Well done Jonas! That Prism of Perception seems highly interesting.


Instant buy, great work.

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Very versatile and intuitive delay. Thank you guys.

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fantastic. everything i want in a looping delay.

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New versions (Prism 2.0.1, Prince 2.2.3) introduces these requested features:

  1. Save/Restore of the buffer between closing and opening Rack.
  2. Freeze and Reverse controls can flip on and off without creating any clicks.
  3. Cv controls works properly for filter in “Prince”
  4. Fix spellings of the divisors (4h → 4th)
  5. Certain parameters are not affected by randomization

Thanks everyone who reported issues and/or suggested improvements,



I caught a very interesting visual bug:

It happens for a second or two when I open a patch. And as far as I can tell it doesn’t affect sounds, just a visual glitch.

System: windows 7 64 sp1

VCV version: 2.3.0


I’m fairly sure that i got that as well but i thought my eyes had gone funny.

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I watched Omri’s video and these modules look awesome!

I’m surprised there’s only been 6 comments about them in a week - they deserve more attention.

Great job Jonas and Omri.


Yeah, I said it in the youtube comments, but I’ll echo it here, terrific work!

I’m excited to spend more time with it :slight_smile:

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I finally made a (very short) video about the volt per octave mode:


Please is the patch available to play with? Always loved Apache as a track! Much appreciated.

Hi ady32,

Here you go:



Stems doesn’t hold the flac-file inside the patch so you will have to load the flac-sample above into stems.

The patch will not download properly into Rack. Every time I load it it appears and then disappears when I move the sidebars. A bit disappointed, not sure what’s wrong. Thanks.

Dear all,

Prism of Perception cannot be found in the module browser on VCV macOS Arm64 2.4 and of course cannot be loaded. On my Windows-PC without problems. Does anyone else have this problem?

Surely I’m just making a stupid mistake? But which one?

It isn’t ported to arm64 yet

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Please contact support (VCV - Support) they should be able to help you!



Hi Jonas,

Thanks for these wonderful plugins! I am experimenting with them a lot these last days and I am wondering if they could have a longer delay size, say 60 seconds. It would then almost be a small time machine, where you can play around with bigger forms. I can imagine they could form the basis of patches that are inspired by the Chase Bliss Habit pedal.

If not, no worries! I am enjoying them already :slight_smile:


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Hi Koen,

The buffer is actually 60s! So good guess :slight_smile: the delay-length only goes up to 20 seconds, but you can access the whole buffer by using the “scan” knob.

Please try it out!

The knobs functions are described here: https://flagaudio.com/vcv/prism-of-perception.html


Well here is the first (bigger) result! thanks again!