soitettaessa
Soitettaessa is a Finnish adverbial participle form of the verb soittaa ("to play, to call"). Morphologically it is created by attaching the temporal adverbial ending -essa/-essä to a verbal stem and commonly conveys "when/while [something is] being played" or "when/while one/people play or call." The form often carries an impersonal or passive sense: it can describe a situation that occurs during an action without specifying a particular subject.
Grammatically, soitettaessa is used to form temporal clauses that are concise and common in instructions, descriptions
In everyday Finnish, similar temporal ideas can also be expressed with subordinate conjunctions (kun + verb) or