https://youtu.be/H8e0PFMo_6E?list=LL8veiH4tExKaroj4Tif84cw&t=530
8:50~8:53 is this sound a trill? what bowing technique is it?
https://youtu.be/H8e0PFMo_6E?list=LL8veiH4tExKaroj4Tif84cw&t=530
8:50~8:53 is this sound a trill? what bowing technique is it?
This is not a trill, but a tremolo or "trembling sound". It has the effect of a single sustained note, but it is caused by bowing back and forth very rapidly, and with very small motions.