I haven't used one of these in a long while but my old bat file has it like this:
--gc3355=\\.\COM15,\\.\COM16,\\.\COM17,\\.\COM18,\\.\COM19,\\.\COM20,\\.\COM21,\\.\COM22,\\.\COM23,\\.\COM24
Along with the other stuff you have which looks about right to me from what I can see
EDIT: Technically this is my bat file for gridseed chips in a g-black. I see you have the '--dual' switch, I would assume you would need a second set of info for the second pool. If you are trying to mine both algos which is what I am guessing from that switch.
I assume you realize those things are essentially worthless for mining anything though right?
EDIT2: Your url looks odd. What is "mining.evo.today"? I don't know that pool but shouldn't it end in .com or something like that? I have this:
--url=stratum+tcp://pool.ipominer.com:3333
Topic: Multiple Grid Seed Orbs (Read 91 times)
is this how I setup multiple gridseed orbs in the start.bat script? minerd --freq=600 --gc3355=\\.\COM6 --gc3355=\\.\COM2 --gc3355=\\.\COM3 --dual --url=stratum+tcp://mining.evo.today:3437 --userpass=MTjmtxNCDyq3mfbYMJpXEB6FJjppw2Mngy:c=XCH
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