u/cantthinkofaname72

I have a Sencore PS148 that I want to hook up to my sound system so that I can visualize whatever audio is coming through it. I currently have the oscilloscope hooked up to the tape monitor output through some speaker wire but it doesn't seem to be doing anything. All I get is a green dot in the middle of the screen that's not moving even a little bit. I'm completely new to oscilloscopes and no almost nothing about it. I got into it just because of oscilloscope music and wanted to be able to reproduce the same effect at home. Thanks for any tips!