Koro şefi her ses grubunu ayrı ayrı dinliyormuşçasına sessizce bekledi.

It means as if he/she were listening or as though he/she were listening.

A simple breakdown is:

• dinle- = listen
• dinliyor = is listening
• -muşçasına = as if / as though

So:

• dinliyormuşçasına = as if listening, more naturally in English as if he were listening

In this sentence, it describes the way the choir conductor waited: he waited as if he were listening to each voice group separately.

Not really, at least not in the usual full sense.

Normally, -mış / -miş / -muş / -müş can mark:

• indirect knowledge
• hearsay
• inference

But in the fixed pattern -mışçasına, the whole ending usually means as if / as though. So here, you should understand the whole chunk -muşçasına as one unit.

So dinliyormuşçasına is not really about reporting or hearsay. It is mainly about appearance or comparison:

• He waited as if he were listening...

The subject is the same as the main subject: koro şefi.

Turkish often leaves the subject unstated in subordinate structures when it is already clear. So:

• Koro şefi ... bekledi = The choir conductor waited
• ... dinliyormuşçasına = as if he were listening

There is no separate subject inside that part, so we naturally understand it as:

• The choir conductor waited as if he were listening...

Because this form includes both:

1. the noun-compound ending
2. the accusative ending

Here is the structure:

• ses grubu = voice group / voice section
  This is a common Turkish noun compound.
• ses grubunu = the voice group / each voice group, as a definite object

More specifically:

• grup becomes grubu because Turkish often softens final p to b before a vowel-initial suffix
• then another ending is added: -nu

So:

• grup → grubu
• grubu → grubunu

It is in the accusative because it is the object of dinlemek and it is specific:

• her ses grubunu = each voice group

Because Turkish very often uses a noun + noun compound where English might use many different patterns.

So:

• koro = choir
• şef = chief / conductor
• koro şefi = choir conductor, literally something like choir chief/conductor

This is the same type of structure as:

• ses grubu = voice group
• okul müdürü = school principal
• film yıldızı = film star

In these compounds, the second noun usually gets a special ending:

• şef → şefi
• grup → grubu

So koro şefi is a very normal Turkish way to express this idea.

After her, Turkish normally uses the singular.

So:

• her ses grubu = each voice group / every voice group

This is different from English, where learners sometimes expect a plural idea. But in Turkish, her already carries that distributive meaning, so the noun stays singular.

Then the object marking gives:

• her ses grubunu

So the logic is:

• her = each / every
• singular noun after it
• accusative because it is the object of dinlemek

This is a very common Turkish pattern. Repeating ayrı gives the sense of:

• separately
• one by one
• individually

So:

• ayrı ayrı dinlemek = to listen to them separately, one by one

In this sentence, her and ayrı ayrı work nicely together:

• her ses grubunu = each voice group
• ayrı ayrı = separately, one by one

Together they emphasize that the conductor seems to be mentally treating each section individually.

Sessizce means quietly or silently.

It comes from:

• sessiz = quiet, silent
• -ce / -ca = an ending that often turns adjectives or nouns into adverbs

So:

• sessiz = silent
• sessizce = silently / in a quiet way

In the sentence:

• sessizce bekledi = waited quietly

This is very similar to English quiet → quietly.

Because Turkish normally prefers the main verb near the end.

A very natural Turkish order is:

• subject
• other information
• main verb

So here:

• Koro şefi = subject
• her ses grubunu ayrı ayrı dinliyormuşçasına = manner/comparison phrase
• sessizce = another adverb
• bekledi = main verb

That final position for the main verb is very typical in Turkish.

Yes, Turkish word order can change for emphasis, but this version sounds natural and neutral.

Not necessarily. It means that he appeared to be listening that way, or that he waited as though he were listening.

That is an important nuance.

So the sentence suggests something like:

• he stood waiting quietly
• in a way that made it seem as if he were listening to each section one by one

It describes the impression or manner, not a guaranteed fact.