Howdy.

Here's an implementation of soft-sync that makes a lot more sense than my previously posted examples.

much simpler and leaner

Cheers.

http://www.pdpatchrepo.info/hurleur/lxi_simple_softsync.pd

groovy

funky

i preferred to do triangles with: expr~ if($v1<.5, ($v1*4-1), -($v1*4-3))
but in extended there is foldback~

Hm, foldback~ is very nice.

Although, it seems like you need to cascade them if you want more than one reflection?

edit-

Ah, no, its necessary to run a wrap~ before it for multiple reflections.

Here's a new method with foldback~

includes an interesting(?) variation

http://www.pdpatchrepo.info/hurleur/lxi_foldback_softsync.pd

and now an even easier tri-generator (untested)
expr~ abs($v1-.5)*2 [0,1]
expr~ abs($v1-.5)*4-1 [-1,1]