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Problem is, that's not all tape does. When you hit it with a loud signal, for example, tape can saturate, which tends to create a nice, warm, low-level distortion aspect. Also, do you want to emulate brand new Ampex 499, or a crusty 40 year old Echoplex loop? This will also make a difference, as the latter will have physical degradation that adds "character" to a sound. Overbiasing ups your highs, some tapes have more noise than others, then there's motor noise/hum from certain tape delays, and so on. Short of ponying up big bucks for an actual tape delay, my suggestion would be to look into some VST emulators of these devices as the best possible solution. There's quite a few out there (some are freeware, even), and some do a very convincing job of sounding like their physical counterparts. Otherwise, well, this might not be a thing that can be made to work 100% in a modular synth, since some of the things you're expecting from the sound just don't have module counterparts.