I found this special etude in a set of rather difficult and virtuosic pieces. I enjoy this piece a lot, it is an excellent study and of great musicality. Sadly Lack is forgotten as a composer nowadays, and I have often read on youtube that people generally dislike his music. Hope this might change opinions! Middle part playing got a bit sloppy, but melody should be clear.
it is in a set of 12 virtuosic etudes published in 1880.
![](https://s2.save4k.ru/pic/7frKrmmTjdE/maxresdefault.jpg)