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For me music written in parts has to be played as parts so you need to be very careful to hold 'held notes' for their full value so that that particular line is not compromised;
Oh, I see what you mean. I thought "parts" meaning "part A", then "part B", then "part A twice" etc. type of parts.
You mean "lines", or may be it's properly called "parts". A violin part, a bass part, a guitar part.
On the English I don't feel that it's higgly-piggly. I see parts clearly. Not that I can play them clearly, but there is no confusion. Contrary, parts fuse and visually are represented more correctly as clumps of music. So you kind of "sculpt" your playing.
On duet or Bandoneon they are separated and are easier to see and to play, so some tough passage on EC is rather simple on Duet (simple to see and understand, but not necessarily to play). I don't think that adapted music must be adhered to very strictly. Bandoneons have good solid bass, and concertinas tend to "moo", so that "mooing" should be kept short, though transcribed long.
You may look at the music I posted as written in two parts. Each may look like single line, or as harmony. Accepting your logic, four part harmony in each hand is music written in 8 parts? I doubt you can find music written specifially for your level in the manner that suits you personally. You have to adjust.
At least you have those low notes and I don't.
Boy, you're picky.
I say, start playing and stop complaining (if you complaining that is).