Info from Brian which can be found in the PDF linked in the version 1 thread
Cave Dweller II (“Dub Ed.”) expands upon the underlying design of CDI , but adds an additional PT2399 for roughly twice the delay time. It also combines the two feedback controls into one. An additional mod has been included if you wish to add a true Mix control to Cave Dweller II.
Cave Dweller II Controls
Time – This sets the delay time.
Dwell – This control is a combined version of the Dwell and Echo controls of CD1 (thanks, Alex!)
Cave Dweller II - Dub. Edition - is for those really cavernous delay needs. It utilizes the current mirror set-up of the “DM-5” delay project to achieve roughly twice the delay time of CD1. The max delay time should yield about 1 sec, although a mod has been included to artificially reduce this, if desired.
In this version, Dwell and Echo are combined into one. The control works slightly differently than CD1. At minimum, the repeats are filtered on the opposite end of the spectrum, meaning they are more “telephonic”. This setting sounds very similar to the Deep Blue Delay. At max, the repeats are dark and ambient similar to the CD1.
One caveat with the combined control is that there is minimal influence on the number of repeats produced by the effect. For those builders who wish to add an additional Mix control to limit the number of repeats, a simple mod has been included. Please see the illustration below on how to implement the Mix control mod.
Additionally, the dark repeats have been limited to non-oscillating by using a larger value for R12 . If you do implement the Mix mod, you can lower the value of this resistor from 750k to a value between 470k and 560k to re-introduce oscillation. This is not recommended when not using the Mix mod.
One other mod has been included with R20 . This resistor resides in parallel with the Time control and allows you to reduce the max delay time of effect. This mod was included for those who prefer a cleaner delay (max delay times with PT2399s tend to introduce some digital artifacts and noise). The value can be selected to taste, and a 200k is suggested. This results in roughly 20% less delay. A 150k resistor yields approximately 25% less delay.
Working voltages as posted by ξεναγός νεκρόπολης:
volt.reg. q1 q2
i.9.22 e.0.05 e.0.06
g.0 b.0.62 b.0.62
o.5.01 c.2.43 c.2.44
pt2399 (both same)