True. The line in the connector is a socket used to attach an audio source. The headphone connector is a socket that is used to attach an audio output device.
You can if the hookups are the same as your car audio source.
Audio In refers to the connection where you would plug in your source for the sound you are trying to hear. For example when you have a guitar and you want the sound to come through and amp then you would plug your guitar into the audio in. If you are working with a mixer or a home receiver, you audio source might be a CD player or a computer.
To connect multiple devices to a single audio source using Y adapters, simply plug one end of the Y adapter into the audio source and the other ends into the devices you want to connect. This allows you to split the audio signal and send it to multiple devices simultaneously.
An audio-typist is a stenographer who uses a tape recorder or similar device as the source of text to be typed.
An audio summator is, in essence, the mixer. It takes various source inputs and "summs them up" into one audio output (to drive the speakers, for example).
Audacity is an open source freeware. It has many functions that you may like. Dexster Audio Editor is good.
A speaker is an audio output device that is used to relay sound from a source. The speaker's volume can be controlled from the source.
The Audio Technica wireless headset microphone does need its own power source, but the power cord is very small and discreet.
Audio editing is very memory and data intensive, so an online program wouldn't work for this. You can download open source editors like Audacity if you want to edit audio.
If I understand the question, you are trying to intertwine different functions. Like your ears, the audio input jack receives an audio source, while the audio output jack transmits outputs audio content - similar to your mouth. If you are trying to redirect the input audio directly to the audio output port you will need a "passthru" (aka monitor) function. -P2E
An optical audio cable is used to transmit digital audio (AC-3) signal from the source to the receiver, such as from a DVD player to a digital audio amplifier/receiver. You can transmit 5.1 dolby digital or DTS surround sound with an optical audio cable, same as digital coaxial audio cable.