Микшер настроен для бэк-вокала.

Настроен is the short form of the passive participle/adjectival form from настроить (to set up, adjust, tune).

In this sentence, it works like is set up / is adjusted:

• Микшер настроен = The mixer is set up

Russian often uses this short form in sentences describing a current state:

• Дверь закрыта = The door is closed
• Прибор включён = The device is switched on
• Микшер настроен = The mixer is configured

A learner may expect something like настроенный, but that is the full form, usually used before a noun:

• настроенный микшер = a configured / adjusted mixer

So:

• Микшер настроен = predicate, part of the sentence
• настроенный микшер = adjective-like modifier before a noun

Because микшер is a masculine singular noun.

The short form agrees with the noun in gender and number:

• masculine: настроен
• feminine: настроена
• neuter: настроено
• plural: настроены

Examples:

• Система настроена — feminine
• Устройство настроено — neuter
• Микрофоны настроены — plural

Since микшер is masculine, the correct form is настроен.

Because the preposition для requires the genitive case.

So:

• nominative: бэк-вокал
• genitive: бэк-вокала

This is a very common pattern in Russian:

• для работы = for work
• для дома = for the home
• для записи = for recording
• для бэк-вокала = for backing vocals

If you are learning Russian prepositions, it helps to memorize them with their usual case:

• для + genitive
• в / на + prepositional for location
• в / на + accusative for direction
• с + instrumental / genitive depending on meaning, etc.

Because бэк-вокал is a hyphenated loanword, and in usage like this, the second part вокал is the part that declines.

So:

• nominative: бэк-вокал
• genitive: бэк-вокала

This happens with a number of compound or borrowed forms where one part remains fixed and the main grammatical ending appears on the second part.

For a learner, the safest practical takeaway is:

• treat вокал as the part carrying the case ending
• after для, use бэк-вокала

Yes, настроен на бэк-вокал is also possible, and it can sound very natural in many contexts.

The difference is roughly this:

• настроен для бэк-вокала = set up for backing vocals, with emphasis on intended use / purpose
• настроен на бэк-вокал = adjusted/tuned for backing vocals, with emphasis on what it is specifically adjusted to

In technical or sound-engineering contexts, настроен на can sound a bit more like configured with this target in mind, while для can sound more general: meant for / prepared for.

Both can work, but they are not always perfectly interchangeable in every context. In this sentence, для highlights function or application.

Yes, it is singular in form, and that is normal.

In Russian, бэк-вокал can refer to backing vocals as a musical function or vocal part, not necessarily to one single voice. Russian often uses a singular noun where English may prefer a plural expression.

So this is similar to talking about a category or role:

• вокал = vocals / singing / vocal part
• бэк-вокал = backing vocals / backing vocal part

This does not mean there is only one backup singer. It often refers to the general vocal layer or purpose in the mix.

Yes—from an English point of view, it may feel like something is missing, but in Russian this is normal.

In the present tense, Russian usually does not use a separate word for is / am / are.

So:

• Микшер настроен literally looks like Mixer configured
• but it means The mixer is configured / is set up

This is a standard feature of Russian:

• Он дома = He is at home
• Она готова = She is ready
• Микшер настроен = The mixer is set up

If you move to past or future, forms of быть appear differently:

• Микшер был настроен = The mixer was set up
• Микшер будет настроен = The mixer will be set up

Yes, functionally it is very close to a passive sentence in English.

Микшер настроен means the mixer is in a state resulting from someone having set it up. The person who did it is not mentioned.

That is why English often translates it with a passive:

• The mixer is set up
• The mixer has been configured
• The mixer is adjusted

Russian often uses this kind of short-form participle to describe the result of an action without naming the agent.

If you wanted to mention who did it, Russian could express that separately, but in this sentence the focus is entirely on the mixer’s current state.

Yes. Russian word order is fairly flexible, although the neutral order here is very natural:

• Микшер настроен для бэк-вокала.

Other orders are possible, for example:

• Для бэк-вокала микшер настроен.
• Микшер для бэк-вокала настроен.

These alternatives can shift emphasis:

• starting with Для бэк-вокала highlights the purpose first
• keeping Микшер first is the most straightforward, neutral way to present the information

So the original sentence is a good default form.

A helpful stress guide is:

Ми́кшер настро́ен для бэк-вока́ла.

Approximate pronunciation:

• Микшер ≈ MEEK-sher
• настроен ≈ na-STRO-yen
• для ≈ dlya
• бэк-вокала ≈ bek-va-KA-la

A couple of useful notes:

• ё is often written as е in normal spelling, so настроен is pronounced as if it were настроён, but standard pronunciation here is настро́ен
• the stress in вокал and its forms stays on the final а in вока́ла

If you want to sound natural, put the strongest stresses on настро́ен and вока́ла.