Line6SpiderIV15N

Hello. I am trying to record with a minijack to minijack cable, via the CD/MP3 slot in my amplifier, and also listen to it without any delay. I am using Windows Sound Recorder to record the audio with currently, as my other programs didn't seem to pick it up. I can't seem to use the headpone slot on the amp to listen to it, and when I try via my PC or Focusrite Scarlett card, I get a serious latency on it. How do I avoid this? Or, how can I listen to what I am recording, without any delay? If you know of another way I could be able to achieve the same results, that would also be appreciated. I'm kind of a newbie at this.