Berlin-based Austrian reedist Boris Hauf has been a regular visitor to Chicago since 1998, often taking up residency for months at a time. He’s developed close ties and friendships with many locals, mostly notably the members of TV Pow. Hauf arrived here Sunday night for a stay of two and a half weeks, and on Wednesday he’ll perform at the Hideout in an improvising quartet with bass clarinetist Jason Stein, bassist Anton Hatwich, and drummer Tim Daisy. Also on the bill is a project called Baseless led by cellist Fred Lonberg-Holm (here doubling on guitar), which includes saxophonist Nick Mazzarella, percussionist Steve Hunt, and analog synth player Aaron Zarzutzki.