What is the "Guslar"
"Perepёlochka" is also known as "Nepenenoyka", "The Music Maker", "Melody Harp".
Theese instruments are similar, but have different tuning. GUSLAR supports all of them.
Guslar program recognizes the sounds of strings and tells you which way to turn the pegs to adjust the strings in the desired fashion. Tuning lap harp is very easy with Guslar app.
The program includes a tuning fork, which allows you to tune the instrument by ear.