the aux switch you build will need a TRS cable from aux pedal to Timefactor.
Switch 1 Tip+Sleeve,
Switch 2 Ring+Sleeve
Switch 3 Tip+Ring+Sleeve
You could get a TRS Y cable but it would activate the aux programming on both pedals at the same time. Might not be a problem if you don't have both pedals active at the same time. Although you would be missing a lot of fun and great sounds not running them both at the same time some of the time.