1 violin note easily doubles volume

It's one thing to put a forte marking in the music of your violinist when writing for strings and piano. But there are certain notes on the violin that, without even trying, immediately make the violin sound MUCH louder... sometimes even twice as loud. The same is true for the viola and cello. To illustrate this, consider that many of the big famous violin concertos that the great violinists play are in the key of D major or D minor (Brahms, Tchaikovsky, Korngold, Stravinsky, Beethoven, 2 of...