Here is what I do with my Strymon Volante:

Synth mono out —> Radial StageBug6 mono in

Radial StageBug6 stereo out (i.e two ts cables connected), signal now doubled —> Patch bay stereo in

Patch bay stereo out —> Volante Stereo in (i.e two ts cables connected)

If I want to connect a stereo out synth I usually change the cables at the patch bay input point.

So in your case, this way you could probably keep the ts to trs break-out cable connected to your pedal with the patch bay and modify only at the patch bay input.