Kammertonen kontrolleres under finstemmingen.

Kammertonen refers to the standard reference pitch used for tuning, often the A that instruments tune to. In English, this is often called concert pitch or the tuning note.

In context, kammertonen is not just any tone; it is the agreed reference tone checked during tuning.

The ending -en makes the noun definite singular.

• en kammertone = a concert pitch / a tuning note
• kammertonen = the concert pitch / the tuning note

So the sentence is talking about a specific reference tone, not just any one.

Kontrolleres means is checked, is inspected, or is verified.

It comes from the verb å kontrollere = to check / to inspect / to verify.

So:

• kontrollerer = checks
• kontrolleres = is checked

The -s ending here marks the passive voice.

So instead of saying who does the checking, Norwegian simply says that the thing is checked.

• Noen kontrollerer kammertonen. = Someone checks the concert pitch.
• Kammertonen kontrolleres. = The concert pitch is checked.

This -s passive is very common in Norwegian, especially in formal or technical language.

Yes. Kammertonen blir kontrollert under finstemmingen is also correct.

Both forms are passive:

• kontrolleres = is checked
• blir kontrollert = is being checked / is checked

The -s passive often feels a bit more compact and formal, while blir + past participle can sound a bit more explicit. In many contexts, both work.

It means during the fine-tuning.

• under = during
• finstemmingen = the fine-tuning

So this part tells you when the checking happens.

Finstemmingen is the definite singular form of finstemming, which means fine-tuning.

• en finstemming = a fine-tuning
• finstemmingen = the fine-tuning

So the sentence refers to a specific tuning process, probably one already understood from the context.

In this sentence, it is a noun.

• å finstemme = to fine-tune (verb)
• finstemming = fine-tuning (noun)

So:

• Vi finstemmer instrumentet. = We fine-tune the instrument.
• under finstemmingen = during the fine-tuning

The structure is:

Subject + verb + adverbial phrase

• Kammertonen = subject
• kontrolleres = verb
• under finstemmingen = time phrase / adverbial

So literally:

The concert pitch is checked during the fine-tuning.

This is standard Norwegian word order for a main clause.

Because Norwegian often uses the passive form directly where English uses is checked or is being checked.

Kontrolleres can cover both ideas depending on context. Norwegian does not always separate those nuances as clearly as English does.

So depending on the situation, you might translate it as:

• is checked
• is being checked

Both nouns are typically masculine:

• en kammertone
• en finstemming

That is why their definite singular forms are:

• kammertonen
• finstemmingen

Yes, it sounds natural, especially in a technical, musical, or instructional context.

It has a slightly formal or procedural tone because of the passive kontrolleres, which is very common in manuals, descriptions, and professional writing.

A more active version might be:

Man kontrollerer kammertonen under finstemmingen.

That means:

One checks the concert pitch during the fine-tuning
or more naturally,
The concert pitch is checked during the fine-tuning.

A rough approximation would be:

KAH-mer-too-nen kon-TRO-leh-res OON-er FEEN-stem-ming-en

A few helpful notes:

• a in kammertonen is short
• tonen sounds roughly like too-nen
• kontrolleres has stress on -tro-
• under is usually pronounced with a soft d
• finstemmingen has stress on the first syllable: FIN-

This is only an approximation, but it can help you get started.