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Theory: Europe is using PAL (50 Hz) and US of A NTSC (Never The Same Color, also 60 Hz). If we go by the theory that most per tick arps are using the VSync as a reference, it may be that European composers found that arps sounded better because of the lower frequency. Lower frequency = more time for each individual note to play, so you can hear better which note it is (without raising the chord an octave).

LSDj's sample playback is dependant on the hardware, which offers a 32 sample buffer. The buffer needs to be refilled at regular intervals. The pitch value is chosen so that the buffer is finished as close as possible to when the next buffer is due. Easy so far.

Then comes the P command. A negative P command will make the buffer playback speed slower, so that each buffer won't have the chance to finish before the next one is written. A positive P command on the other hand makes the buffer play faster, so it might finish several cycles in between each buffer refill.
So, the exact types of sound you can get out of it are tied to the 32 sample buffer size.

Maybe. Shouldn't be too hard unless your iron completely sucks. However, this gave me an idea. If you're building your own unit and you're afraid of surface mount, you could use a pin header and base your design around an FTDI, like this one: https://www.sparkfun.com/products/9716?

Yeah, this should work. Someone just needs to write the software. I'll ping mikeryan.

Major concern, is the screen working?

They don't use RAM. However, the ROM header reported that they did, so if you opened one of the old ROMs in an emulator, it would create a sav file that's completely unused. Crikey. I fixed this too.

Winzip? I hope not. All civilized operating systems these days come with tools to pack and unpack zip files out of the box. And even so, there are better programs for handling cmopressed files.