There could be three problems here. The first one is when you said "Selected the button to add an instrument." Are you adding an audio track or an instrument track? The second potential problem is that on your Audiobox USB 96 there is a knob connected to each input that controls the input volume. The third problem is that on your Audiobox the mixer knob is turned all the way to the left or the "input" side. It won't play back sounds from your computer if it's like that.
Here's what I would do, step by step:
- Make sure the computer is turned off
- Plug the guitar into the Audiobox USB 96
- Plug the Audiobox into the computer
- Turn on the computer
- Open Studio One
- In the top bar navigate to Studio One > Options
- Make sure your audio device is set to "AudioBox"
- Close the options menu
- Hit "create a new song"
- Select the "empty song" template
- Hit "OK"
- Turn the knob that corresponds with the input you're using on your Audiobox to full
- Play your guitar
- While playing your guitar turn the knob down until the red "clip" light doesn't turn on
- Hit the add tracks button
- Name the track
- Set the type to audio
- Set the count to one
- You can chose to manually color it or hit "auto color"
- Set the format to "mono"
- Select "no preset"
- Set the input to the input that you have your guitar plugged into on the audio box
- Set the output to "main"
- In the track list make sure that the "record" and "monitor" buttons are enabled on your track (The circle and the speaker looking ones. They should turn red and sky blue when enabled)
- Hit the record button in Studio One
- Record your guitar
- Hit the record button again to stop recording
- Hit the return to start button
- Make sure the mixer knob on the Audiobox is set to "playback"
- Hit the play button and you should hear it
Sorry for the long list, but if you have any more questions just reply.