Thanks! Yeah switches- I love them because they are one of those "building block" modules that has a simple function which can lego together with pretty much anything. A few ways I use the Doepfer A-151:
Have them switch through four different modulators routed to the pitch or root in on metropolis, and then clock the switch so that every time metropolis finishes a pattern it's root is sequentiallay changed.
Set them to 50/50, two possible outputs, and trigger the switch with the URA or sloth for true random switching.
Run them at audio rate and do nasty waveshaping.
Make the WMD sequential switch matrix a 64 step 1 channel sequencer.
Route multiple waveshapes out of an VCO into Warps, i.e switch between saw, tri, etc. rather than just one.
Flip between two totally different 1v/o CVs into a VCO, completely changing a melody.
Basically with switches it is awesome when you are feed something modulation X, and while you're listening to that, modulation Y is being changed. Then you flip back to listen to modulation Y, and now modulation signal X is being altered in the background. If that makes sense! In other words, if you are into self playing/automation type stuff then you want switching.
In general I find them cheap and indispensable! I really love WMD's Sequential Matrix because it lets you step through pages of matrix connections, and even randomize them! Super under appreciated module IMO.
I'm not familiar with the VCO by Elby, but I like their stuff. What's it's premise of operation? It looks very additive, interesting.