onryou wo mou sukosi agete kudasai.

It is read:

おんりょう を もう すこし あげて ください。

In normal Japanese writing, you would usually see it without spaces:

音量をもう少し上げてください。

The spaces are often added in beginner materials to make the parts easier to see.

音量（おんりょう） means volume in the sense of sound level.

It is a normal and useful word, especially when talking about TVs, speakers, phones, music, and so on.

Examples:

• 音量を下げる = lower the volume
• 音量を上げる = raise the volume

In everyday conversation, people also sometimes say things like:

• 音をもう少し大きくしてください。

That also means please make the sound a little louder, but 音量を上げてください is very natural too.

を marks the direct object of the verb.

Here, the verb is 上げる, which means to raise.
So 音量を上げる means to raise the volume.

You can think of it like this:

• 音量 = the volume
• を = marks what is being acted on
• 上げる = raise

So 音量を上げてください is literally something like Please raise the volume.

In this sentence, もう少し means a little more or a bit more.

That is a very common beginner question, because もう can mean different things depending on context.

Here:

• もう = more / a bit further
• 少し（すこし） = a little

Together:

• もう少し = a little more

So this is not again here.
It means the speaker wants the volume increased, but only by a small amount.

Examples:

• もう少しゆっくり話してください。 = Please speak a little more slowly.
• もう少し待ってください。 = Please wait a little longer.

上げて is the て-form of 上げる.

The pattern:

• て-form + ください

is a very common way to make a polite request.

So:

• 上げる = to raise
• 上げて = raising / raise (in て-form)
• 上げてください = please raise it

This is one of the most important basic grammar patterns in Japanese.

This is about the difference between a transitive and intransitive verb pair.

• 上げる（あげる） = to raise something
• 上がる（あがる） = to rise / go up

Here, the speaker is asking someone to actively change the volume, so Japanese uses the transitive verb:

• 音量を上げる = raise the volume

If you used 上がる, the meaning would be that the volume goes up by itself:

• 音量が上がる = the volume rises

So 音量をもう少し上げてください is correct because the listener is being asked to do the action.

ください makes the sentence into a polite request.

So:

• 上げて by itself can sound like raise it
• 上げてください = please raise it

It is polite, standard, and very common in everyday Japanese.

Not super formal, but definitely polite enough for many situations.

It sounds polite and direct.

音量をもう少し上げてください。 is perfectly normal when speaking to:

• a waiter
• staff
• someone operating equipment
• a friend, if you want to be polite
• a teacher or classmate in a normal situation

If you want to sound softer or more indirect, you could say:

• すみません、音量をもう少し上げてもらえますか。
• すみません、音量をもう少し上げていただけますか。

These feel a bit more indirect and softer than ～てください.

Japanese often leaves out subjects when they are obvious from context.

In English, you would usually say:

• Could you turn up the volume a little?

In Japanese, the you is usually omitted because it is clear that the speaker is talking to the listener.

So the sentence does not need a subject:

• 音量をもう少し上げてください。

That is completely natural Japanese.

Yes, often you can.

• もう少し = a little more
• もうちょっと = a little more / a bit more

So you may hear:

• 音量をもうちょっと上げてください。

This sounds a bit more conversational.

A rough nuance:

• 少し is slightly more neutral or standard
• ちょっと is a bit more casual and conversational

Both are very common.

Usually, を is the normal choice because 音量 is the direct object of 上げる.

• 音量を上げる = raise the volume

If you used は, it would change the nuance by making 音量 the topic, often with contrast or emphasis:

• 音量はもう少し上げてください。

This can sound like:

• As for the volume, please turn it up a little more
• or it may imply contrast, depending on context

For a straightforward request, を is the most natural choice.

Yes, it is very natural.

音量をもう少し上げてください。 is a normal, useful sentence for real-life situations, such as:

• asking someone to turn up the TV
• asking staff to increase the microphone or speaker volume
• asking someone to make audio louder during a meeting or presentation

It is simple, grammatical, and practical Japanese.