When I wrote my string quartet Culs-de-sac (en passacaille) in 2009, it was evident to me that I should develop the sonic soundscape that I have created in that piece. I have decided that I write a cycle of compositions for string quartet and its subsets. Tr (épilogue) marks the second piece that I completed in this cycle. Its title has a precursor; Tr for violoncello and piano, of which I took the formal scheme as a point of reference for the solo piece. I took the duo piece, stripped away the piano part, and enlarged the piece by adding musical commentaries. As the title may suggest, I intend that this piece concludes the cycle. In the spirit of concluding the cycle, my focus in this piece was to illuminate the gestures of ‘farewell,’ in the sense that the envelope of the phrases has the conscious trajectory of fade-out. Many thanks to Patrick McGuire who, in the symposium Creative Dialogue V, premiered the work-in-progress version as a part of Santa Fe Chamber Music Festival. Also thanks are due to Anssi Karttunen and Magnus Lindberg, whose commentaries and feedbacks were crucial to the development of the piece. Tr (épilogue) is dedicated to Pierre Morlet and Mark Andre.