Hi, it's hard 2 explain.... I made a drawing... So when my comment below ins't clear I can set you the drawing....

Sequence plays D-E-D-B-D-E-D-B-D-E-D-B-D-E-D-B- de CV goes 2 a delay that process the CV & the output is the same CV but in timing D---E---D---B---D---E---D---B---D---E---D---B---D---E---D---B--- this output goes 2 a VCO and produces the delayed melody...

Your remark "unning the sequencer at half the clock rate" should be the FX, the output...

I hope a bit less wondering :-)