[2] At age ten, he was encouraged by his mother to learn about seitai, so he started to attend regularly the dojo of its founder, Haruchika Noguchi, of whom he would later become a direct disciple until his Master's death in 1976.

The connection between musical education and Noguchi's seitai is captured in this autobiographical comment by Katsumi:[3]"My mother, who was from Tokyo, was in this city (Matsumoto) during that time because of World War II and, passionate about Suzuki's teaching, collaborated with him as a secretary practically since the founding of the school.

[4] Having completed his university studies, in 1969 he wanted to breathe the air and culture of Pau Casals, a musician whom he highly appreciated, and decided to move to Barcelona.

[7] In addition to his work in attending many people individually on a daily basis and coordinating practice meetings in various locations in Catalonia,[8] Mamine began teaching Seitai Soho to some students.

Some of his students have started seitai dojos all over Catalonia (Barcelona, Mataró, Terrassa, Cerdanyola, Sant Pere de Ribes, Reus, etc.)