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I will be putting him on tk 1. When I xfer to daw, I will also include my empty tk 4. My theory is that the hiss will be the same, and I can cancel it out by flipping its phase and blending it in.
So might this work? Is hiss identical across tape? In years of listening to 2 track masters the hiss never sounded like a stereo event so I'm thinking I might be right.
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More seriously, putting anything in that you have to take out later is not a good idea. In this situation I'd leave a good run in on the track you're using then take a noise signature from it to use with noise reduction to give a cleaner sound. Fidelity is less important than clarity.
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Audacity - which is free - has a noise-reduction facility, but I find its preset mode a bit heavy-handed. Indeed, most of the noise-reduction presets in various editors etc seem a bit over-zealous in their efforts, meaning that artefacts get introduced into the recording.
Not being able to afford/justify the cost of something like Izotope I've found that Magix Audio Cleaning Lab is surprisingly competent if used with manual settings. It has easily adjustable parameters that let you hear what your adjustments are doing to the sound as well as the ability to hear what you're removing so you can judge how much signal you're taking out with the noise.
And as is frequently mentioned when this topic comes up... better to take several gentle sweeps/cleans rather than one mega-one.
... as for your original idea... try it. However, as has already been said, I suspect the end result will be that a significant amount of your recording gets lost along with the hiss.
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However, what will work is to record the same thing across all the tracks. The signal level will quadruple (+12dB) while, because it is random, the noise level will only double (+6dB). The only issue to watch out for is that you play the tape back on the same machine it was recorded on as any azimuth errors will become far more important when the same signal is recorded across the whole tape width.
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