From Martin Hackleman's "34 Characteristic Etudes for Low Horn Playing" book. This particular etude is great to focus on smooth shifting in and out of the pedal/mid-low register, dynamic range, and keeping time with these legato lines.

From Martin Hackleman's #34 Characteristic Etudes for Low Horn Playing" This is one of my favorite etudes, but also very challenging for me! It requires a lot of ease of tone in the softer pedal register, while also being able to shift into louder and "higher" mid-low range seamlessly.