0:20 I've learned to stop using "FX" busses and use "Aux" busses instead for FX sends. This has several benefits. First, it removes the restrictions on what FX racks you can assign the audio to. If you use FX sends, you can only assign those sends to the first X FX racks (where X is the same number of the FX sends). So in your example, with only three FX sends, you will only be able to assign them to the first three FX slots. If you use auxes instead, you can assign them to any of the 12 FX slots. (This makes it much easier to add another buss fed FX at some later point in time without having to reassign all of your FX racks). Second, it provides all of the normal aux processing like filters, EQ, compression, etc. I doubt you'll need all of that for an FX send, but the actual FX sends allow little to no processing which can be limiting at times.
0:20 I've learned to stop using "FX" busses and use "Aux" busses instead for FX sends. This has several benefits. First, it removes the restrictions on what FX racks you can assign the audio to. If you use FX sends, you can only assign those sends to the first X FX racks (where X is the same number of the FX sends). So in your example, with only three FX sends, you will only be able to assign them to the first three FX slots. If you use auxes instead, you can assign them to any of the 12 FX slots. (This makes it much easier to add another buss fed FX at some later point in time without having to reassign all of your FX racks). Second, it provides all of the normal aux processing like filters, EQ, compression, etc. I doubt you'll need all of that for an FX send, but the actual FX sends allow little to no processing which can be limiting at times.