There are ways you could do it without a mic, but you'd be making it much harder than it needs to be. You could have another person call out when they're about to shoot the node and just stay near someone when fractured to make sure they remove it at 7 stacks. The biggest problem would be with the glyph call outs. Only think I could think of is you would need to wipe until you were glyphtouched so they could tell you. Although, if you memorised where each glyph was, you would be able to do the whole mechanic yourself.