For the TRIPLE, AND QUADRUPLE STOPS, especially, the player usually plays the low strings first then sweep to the high strings. I have tried on the Quadruple stops playing back on NotePerformer/HSE/Spitfire BBCSO discover, the four notes are played together no matter which playback engine is used. It seems I need to manually adjust the length of the lowest two notes to generate a real sounding Quadruples.
I want to know whether there is anything missing on my writing?
Is there any symbol for DOUBLE, TRIPLE, AND QUADRUPLE STOPS need to be placed on the notes?