Hi There,
I was sent a midi file from a friend who recorded a piece on their Roland RD800 keyboard. They have it connected to a PC and use a free midi program (https://www.midieditor.org/) to record.

However, the velocity values are very uneven. Generally very quiet but then some notes are suddenly very loud. I also notice a big increase in the amount of pedal and this makes the resulting midi very blurry when played on another instrument (or rendered with a piano software).

When looking to resolve such a problem, where are the first places to start? Ie could it be the quality of the midi cable or could the keyboard itself just need some form of calibration? Thank you!