In addition to my post Blowing together, here are some recordings and videos of duets arranged or written by Fukuda Teruhisa. Some are based on traditional honkyoku, others are original compositions.
Renbo-Sugomori (Sokaku reibo)
Here are two different versions of this duet.
Koten Honkyoku duets
Azuma no Kyoku (Azuma-Jishi)
Shirabe-renbo (Honte Choshi)
Hijiri Honte Choshi (Honte Choshi)