Nenbutsuichie (念仏一会)
Nenbutsuichie means repeating a Buddhist invocation, i.e. Namu Amidabutsu (a single, sincere call upon the name of Amida).
How to chant
In the case of aimauchi (interval drumming), beat mokugyo (a fish-shaped wooden drum) at O. Beat mokugyo strongly at ●, softly at O and moderately at △.
NamuamidaObu, NamuamidaObu, NaOmuaOmidaObu
NaOmuaOmidaObu (which may be repeated any number of times, even a million times)
NaOmuaOmidaObutsu, NaOmuaOmidaObu, NaOmuaOmida●bu
NaOmuaOmidaObu, NaOmuaOmidaObu, Na△muaOmida●bu
More specifically, it sounds like:
Na-Omua-Omida-Obu.