[sdiy] Reverb modules

[David G. Dixon]

This recent talk of the Belton reverb has reminded me that I want to add a
reverb module to my modular.

So, Team, which reverb modules do we like?  Do folks typically put spring
reverb tanks in their modulars, or is there an IC-based option which is
decent?

Is there a cheap way to get delay into the module as well?

Also, does anyone have a schematic for what's actually inside the Belton (or
something similar)?  I'm not that keen on spending $18 on a little black box
if I can avoid it.