Rub a dub reverb infinite repeats and other mod ideas

[llmdcll]

So I've build the rub a dub using this layout
http://tagboardeffects.blogspot.com/2014/07/rub-dub-reverb.html?m=1
I used the long version of the brink and I'm really digging the verb.
After completing the board I was messing with a few mods. I'm trying to add a momentary switch to get the infinite repeats. My first to at it was just adding a feedback loop with a momentary switch and a trimmer to control how much is being fed back into the input. At full blast it's just insane loud drone feedback but I was able to almost get the sustain I was looking for. On certain settings it would sustain for a little but then get louder and go to straight feedback drone noises. I also experimented with an ldr instead of the momentary switch and used a flashing led to get almost a modulation type sound ringing behind the notes you play. This is my first reverb build so for this one I'm going to just box it up how it is from the layout and order another brick to really experiment with. I feel like the deluxe rub a dub would be a better circuit to mod since there are more controls over the reverb but I'm trying to see if anyone has ideas to achive the infinite repeats or other cool mods to do to this circuit. I'm looking for almost the sound of the ehx freeze but I've seen it posted as the infinite repeat mod on some delays. Any input would be amazing I'm trying to seek the help of people smarter than me.

[samhay]

You want the flying saucer noise:
http://www.diystompboxes.com/smfforum/index.php?topic=107226.msg974393#msg974393

Take a look at the various other BTDR-2 circuits with at least 3 knobs (and typically 4 op-amps) and see how the feedback works.  This is not what the Rub a Dub Deluxe does - it uses the new unobtanium BTDR-3 brick.

[llmdcll]

I'll check that our for sure thank you. I wanna look more into other circuits that are more mod friendly but I was trying to see if this version has any cool mods that could be done. I picked this for my first verb build because it seemed the easiest and a good place to start