How do I set the Track Header in such a way that both the solo and mute are turned off?

How do I set the Track Header in such a way that both the solo and mute are turned off?

Another possible solution is to use a battery grip on your 70D and see if the dial on the grip will change the shutter speed.
There are some discussions about this problem on some earlier models Canon DSLR. Check it out.
http://www.dpreview.com/forums/thread/2638326

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