I use the Zoom H4n when I want really good sound quality compared to the awful laptop built-in sound card. It seems like the audio clips if I turn it to 100 on the H4n. What is really the 1:1 ratio, so that maximum output from the computer will give maximum output on the Zoom H4n? (So it doesn't clip, and doesn't stay way below.)
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The level you need to set on the H4n would depend greatly on the signal level coming in from the computer and may even be affected by the type/length of cables in between. As with any other recording device you will need to experiment a bit to get the levels right.
First turn the levels down to a point where they are not clipping. Record the loudest thing you will be working with and find the loudest part of the recording. Turn up the levels a bit and record just the loudest section again. Repeat until it clips and then turn it down just a bit. This will get you a safe recording level for the loud stuff.
If you are also recording quiet stuff you can either adjust the levels accordingly or add a compressor to regulate the levels a bit automatically.
You will run into a similar problem on the output from the H4n to any other device. Some devices will accept higher levels than others without clipping, and the type/length of the cables used will still have an effect.
Unfortunately, there is no way to find the level you seek without experimenting.