The way you use Impulse Responses with a multi-effects unit is you connect your pedal to your computer, then you're able to upload the IRs into the pedal. Then you add an IR module to your signal chain.
Why do you need impulse response?
The idea of an impulse response is to capture all of that information in one go, so you can instantly recall that setting. This means that wherever you are, you can retain your preferred tone, right down to the detail of your favourite mic placement and room sound.
How do you open an impulse response?
In Logic Pro, click the Sampled IR button above the main display. When you first click the Sampled IR button, a Load impulse response window opens. Choose an impulse response file from any folder.