If I understand your signal flow, you want the TimeFactor and the Modfactor in the insert of the H90, correct? If you want the TimeFactor and ModFactor to produce stereo audio, you need to make sure you’re using a stereo insert, not a mono insert. Go out of Outs 3&4 into ModFactor in stereo, then out of TimeFactor to H90 IN 3&4. The signal sent to the Strymons will be stereo all the way.