Yeay,.. first post on TA, here go's:
I had sort of the same problem. I guess you'll have an electric guitar. The (audio)signal that is comming from you guitar is very low. Most likely you have to put an amplifier between.
If you audio signal is low, you can try to put an software amplifier (like guitarrig 3) on your audio channel and boost up the volume. But you have to watch out, in this way you will increase to signal-to-noise ratio and you audiorecording will be heavy 'noised'. So don't just turn the volume way up.
You can also try to create an audio track in Cubase with the input selected where you have your guitar connected. Make sure that you select the audio track and click on the grey little speaker (turns brown when clicked on) this will allow you to 'preview' the audio signal.
What you can also do is - if you have a synthesizer - let the guitar signal go thru the synths line input. On the synth there most likely is an amplifier that let you boost the sound from your guitar. I do this with my Supernova, coolest of all is, you can use the effects from your synth on your guitar.
Hope I helped you out a bit.
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Hernandes ft. Stine Groove - Without You (Kyota remix) (Redux Recordings)
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