Some felt tip pens make characteristic squeaking sounds
when being used on certain types of paper. These sounds,
along with many others are enjoyed by many artists and
designers.
Given the ability for apps like Procreate to imitate the
visual effects of most drawing instruments, including
felt
tips, many illustrators have taken to using an iPad
combined with the app to generate their work. There are
numerous advantages, but the haptic feedback of a pen
dragging along textured or smooth paper is gone, along
with all the resulting sounds of course.
Some of this is now restored when you install Procreate
Sound Effects, which replicates the sound as close as
possible to the original instrument reacting to the chosen
surface.
Now when you are mixing colours, you can hear the pallete
knife swishing the thick pigment around on the glass
surface; the blade cutting through paper as you slice up
images; and of course the subtle squeaking of felt tip pens
creating an illustration.
It can even do 'nails on a blackboard' and other diabolical
noises for those who like that sort of sound, or want to use
it to torture others.