diff --git a/Design-notes-and-ideas.md b/Design-notes-and-ideas.md
index 88bb3e0..3776757 100644
--- a/Design-notes-and-ideas.md
+++ b/Design-notes-and-ideas.md
@@ -14,4 +14,9 @@ Additional designs:
 
 - https://befaco.org/docs/ADSR/ADSR_V2_0_3_Schematic.pdf
 - https://www.modwiggler.com/forum/viewtopic.php?t=94991 (and http://l-1.su/VCADSR.html)
-- http://m.bareille.free.fr/modular1/adsr/mb_cvadsr2.htm
\ No newline at end of file
+- http://m.bareille.free.fr/modular1/adsr/mb_cvadsr2.htm
+
+Design work:
+- https://tinyurl.com/262545wh an all-CV version from MW
+- https://tinyurl.com/29o5pmtl an all-CV version from MW, reportedly works better but also contains numerous additional features
+- https://tinyurl.com/2baxgwjf my attempt to graft VC into the 555 design (WIP)
\ No newline at end of file