Here's my quick explanation:
A "bus" in Logic 8 (and in electronics in general) is a "common pathway", not a type of channel as it was in Logic 7. You use a bus to "send" one or more signals along this common pathway to a some kind of destination. Either they can be routed to an auxiliary channel (which happens automatically in L8) for grouping before outputting, or, sent to an auxiliary channel for applying a common effect by inserting that effect as a plugin to the "aux". Or, the bus (common pathway) can be routed to an input channel in order to record all of the signals on the bus as a single audio file. And, in this configuration, these bussed signals will be recorded directly from the bus (common pathway) to the input channel NOT from the output of the aux channel! Yes, an aux channel is created when set up a bus but you don't have to use it. You can delete that aux channel from the environment without affecting the signals on the bus. Or, you can remove the bus from the aux channel's input. Either way, the signals will still remained bussed...
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