I use a T.C. Helicon with my Audya 5 and it works great. A midi cable from the Audya to the harmonizer, the TC on midi ch. 4 and it will follow perfectly. I use a boss fs-5L foot switch on the floor to turn the harmony on and off. Hope this is helpful.
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Mr. G ,OASYS , KRONOS ,Jupiter 80 , AUDYA 5, Midas Venice ,Danley Labs sm-60f's ,Danley TH mini subs, QSC KW 122's,118 sub , Senhieser and Heil , Audix VX-10 , TC_Helicon ,ZOOM 9200, Lexicon ,Alesis ,AKG solid tube ,AB international Power Sub3600