Restart curve~ ramp from a specific value?

Hi everyone, I'm working on a patch that lets the user automate the spatialization of some sources in spat; everything works fine and I have a subpatch that controls the xyz of every source correctly (function goes to curve~ which sends the list of xyz to spat.oper); the problem is that whenever you pause the playback of the track and select a specific portion of it, the curve~ stops being coordinated with the playback. I already did some pause/resume functions but what I want is that whenever I select i.e. the millisecond 22.000 as selection point on the waveform~ object, the curve~ resume its playing from there. Is it possible?

I've already tried messages like "resume $1" and "start $1" but didn't work. Here's an example of how the subpatch works for a track. Thanks in advance!