(and sniff)

two auto-filter modulating deep reverbs for your KORG logue-sdk compatible synthesizers

Video Demo

If you wish to use a more traditional version of this reverb, check out Cathedral and Theatre. These versions use a little less internal reverb modulation, and allow you to control the filter cutoff manually.

As always, these are to be used at your own risk!

A quick word...

I've been having a ton of fun creating these plugins. If you like stuff like this and my other work, by all means feel free to contribute whatever you can to help support this!

Ensure you have the KORG minilogue/prologue sound librarian installed. Now, before you do anything else, perform a full and complete backup of your synthesizer and save this to disk before continuing. See the sound librarian manual for instructions on how to do this if required. Next, select the USER REVERB FX tab on the librarian, and drag and drop the requisite file(s) to an available slot in the librarian :

* * * Important! * * *

You should know there are two different types of each reverb:

  • breathe_pro and sniff_pro - these effects are designed to work with the prologue, and have a slightly 'thicker' algorithm. they can be used on the minilogue-xd and the NTS1, however do note that if you enable all 3 effects at once, dropouts due to FX CPU overload may occur. If you however just use the modulation and the reverb, you will likely be OK.
  • breathe_xd and sniff_xd - these effects are designed for the minilogue-xd and the NTS1, where you can use all 3 effects at the same time. Note, the algorithm has been trimmed down a little, so you may notice a slight difference in the sound.
  • for minilogue-xd and NTS-1 users, you can use any of the .prlgunit files, currently the librarian accepts these as they are. See above for caveats regarding running the _pro versions of the effects on your minilouge-xd or NTS1.
  • for prologue users, while you can install and run either the _pro or the _xd versions, do note that the _pro versions are the effects 'as intended' - and are slightly more complex and can sound a bit 'thicker' than the _xd versions.

The effect type ("pro" or "xd") is also reflected in the effect name.

Also note : Currently, the minilogue-xd and the NTS1 do not support running user reverbs along with user delays. If a user delay is selected the reverb will be stopped, and you may have to re-start it by turning the effect off and on again, or re-selecting it (after you have unselected a user delay). The same goes for selecting a user reverb with a user delay selected.

About these reverbs...

Overall, this reverb incorporates a filter in the reverb, who's cutoff is controlled via an ASR envelope generator that is triggered by audio presence.

  • "breathe" uses a low-pass filter. The filter is normally mostly "closed" at a low frequency (~100hz) and will "open" as the envelope is triggered
  • "sniff" is the same, but uses a high pass filter. The filter is inverted - it is mostly "open" at a high frequency, and will "close" to a lower one as the envelope is triggered.

Overall, the reverb iself is very "big", and with a bit of internal delay modulation coupled with the sweeping filter, this can allow you to get a fairly "big" sound from even the simplest sound sources. The reverbs also allow for 'infinite' feedback, resulting in a 'frozen' reverb. Even so, in this state the reverb will eventually, slowly devolve into chaos and noise - however this may take quite some time. Do note that currently, when the reverb is in this state, it will still allow more input to the reverberators, adding much more sound overall.

In addition, you can 'freeze' the current cutoff frequency by setting the "Time" knob to 100%.

As mentioned above, on the minilogue-xd and on the NTS-1, the "_xd" versions use fewer reverberators to reduce the CPU overhead to allow running factory delays along with mod effects and this reverb. You can still use the prologue version on the minilogue-xd and NTS1, but running this with mod effects and delays enabled at the same time may not work correctly and is not advised.


  • Time: Controls the overall reverb time. At 100%, this is 'infinite' - however, when the envelope generator is allowed to reduce to minimum, this time is slightly reduced to allow the reverberators to clear.
  • Depth: Controls the rate at which the ASR envelope generator runs at. Lower values = faster attack/release times. At 100%, the current envelope level will be stopped to allow you to continue to play using this filter cutoff.
  • Shift+Depth: Sets the wet/dry levels. This reverb can be a lot of fun with a 100% wet signal.
If you wish to use a more traditional version of this reverb, check out Cathedral and Theatre. These versions use a little less internal reverb modulation, and allow you to control the filter cutoff manually.

Play around with the settings and have fun!

Download the zip here (contains all files as described above)