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I have today set up itunes and there is a mono option.

From your notebook your music player should have the option to make a mono signal from stereo.
VLC or Foobar both have the option and you can phase reverse also to match the guitar so the two inputs...

It`s called duck billing, the reasons for it are mostly temperature. More water at the start?

I think the grading is to do with second hand sleepers.

Most thicknessers cutterheads spin at 4,700 rpm to 6,000 rpm the motor usually 2800 rpm
runs about a 2 to 1 pulley reduction via v belts.