By this time the line-up was built around a core of Karrer (mainly violin and guitar), Weinzierl (guitar, bass, piano), Rogner on keyboards, bass player Dave Anderson, and two drummers (Peter Leopold (born 15 August 1945) who had joined the group from Berlin, and Dieter Serfas.

Their second album Yeti (1970) saw them introducing arranged compositions along with the bluesy violin and guitar jams such as the long improvised title track.

By this time bassist Anderson had returned to England and joined Hawkwind, to be replaced by Lothar Meid (born 28 August 1942), and the group was augmented by synthman Karl-Heinz Hausmann (Karrer had formed a short-lived group in 1966 – supposedly named 'Amon Düül O' – with future Embryo founders Lothar Meid and drummer Christian Burchard).

A memorial service was held for Leopold in Munich, where the remaining members of Amon Düül II sang a song for him.

Leopold was replaced by multi-instrumentalist Daniel Fichelscher, for many years guitarist and drummer of Krautrock group Popol Vuh.

[10] Fichelscher is not new to the group, and in fact has had a long affiliation with Amon Düül II, having played with them as early as 1972 on Carnival in Babylon.