'Special Lockdown Versions' of some of Simon Paul Austin's string quartets are available on Musicaneo for use when home alone.  This is how it works.  Download the applicable sheet music and you get all the music of your part from start to finish.  There are versions for violin, viola and Cello.  You can then play the audio file which contains all the other parts, also from start to finish.  To get you started in tempo there is a metronome count in and the first few notes of your part on the audio file.  It is a wonderful way to be part of a string quartet when home alone and the music is great to play and great to listen to.