i had exactly this problem when i was putting my rack together - i got round it (very cheaply) by using a splitter box like this - http://www.dolphinmusic.co.uk/d2/page/shop/flypage/product_id/991/category_id/99b83856bb14cc97ff30736eae541cb6 which send stereo signals (via y-leads) to a repeater and two tc d-2's the original signal and the outputs of the fx go into a MAM SLM-82 8 channel mixer - http://www.mam-germany.de/ the fx units are set to 100% wet. probably cost me about 120 quid and it's completely silent and very light! sim