For example, if you’re using a single Apollo x8p, select the “Single-Apollo x8p PT ” preset from the I/O Presets menu. You can select one of the I/O presets already available that matches your configuration which will align your line inputs and outputs automatically. In order for the channels numbers to correspond, we must insert “null” values for the first 2 inputs so that Mic/Line/Hi-Z 1 lines up with Line Output 1, Mic/Line/Hi-Z 2 lines up with Line Output 2, and so on. In the default Apollo I/O setup, the first two input channels are Mic/Line/Hi-Z 1 & Mic/Line/Hi-Z 2, however the first two output channels are Monitor L and Monitor R. The Pro Tools Hardware Inserts feature requires that you connect your external gear on the same input and output channels of your Apollo interface, i.e., Line Inputs 1-2 and Line Outputs 1-2. In order to use the “Hardware Inserts” feature in Pro Tools, you will first need to change the default I/O setup on the IO Matrix page of Console Settings (Console > Settings > IO Matrix). For more information, see the "PT Mode" section in the "Working With Apollo" chapter of the Apo llo Software Manual (FireWire).
If using an Apollo Twin, see the Using Hardware Inserts with Apollo Twin article.