I've connected an IPod to the main speaker microphone input; I get no sound at all.

It sounds like the issue might be with the routing of the signal from the wireless microphone to the main output on the mixer. Make sure the wireless microphone is plugged into the correct input channel on the mixer and that the channel is properly selected and turned up on the mixer.
Also, make sure that the main output on the mixer is selected as the output source and that the level is turned up to an appropriate level. It's possible that the level might be too low or the wrong output might be selected.
If you're still not getting any sound, try plugging in a different audio source (such as a phone or MP3 player) into the mixer's input and see if you can hear any sound through the main output. If you can hear sound from another source, then the issue might be with the wireless microphone or its connection to the mixer.

plug the second to one of the inputs of the first.

Not all ipod classic work with your SC-HC57 you need an older Panasonic SC-HC30 to work with that ipod :( or an iphone or ipod touch to work with your SC-HC57

Determine where in the mixer's signal path to connect the unit. Your options are:
1. One or two individual microphone channels via the mixer's CHANNEL INSERT in/out jacks.
2. The monitor mix output via the mixer's MONITOR OUT jacks.
3. The main mix output via the mixer's MAIN OUT jacks.

2 Connect a balanced cable with the appropriate connectors from CHANNEL INSERT OUT jacks on the desired mixer channel to INPUT RIGHT or LEFT on the Feedback Destroyer's back panel for individual microphone channels. Connect a balanced cable with the appropriate connectors from the OUTPUT RIGHT or LEFT jacks on the Feedback Destroyer's back panel to that mixer channel's CHANNEL INSERT IN jack.

3 Connect a balanced cable with the appropriate connectors from the mixer's MONITOR OUT jacks to the INPUT RIGHT or LEFT jacks on the Feedback Destroyer's back panel for the monitor signal path. Connect a balanced cable with the appropriate connectors from the OUTPUT RIGHT or LEFT jacks on the Feedback Destroyer's back panel to the monitor amplifier INPUT jack or amplified monitor speaker INPUT jacks.

4 Connect a balanced cable with the appropriate connectors from the mixer's MAIN OUT jacks to the INPUT RIGHT or LEFT jacks on the Feedback Destroyer's back panel for the main mix (FOH) signal path. Connect a balanced cable with the appropriate connectors from the OUTPUT RIGHT or LEFT jacks on the Feedback Destroyer's back panel to the main amplifier INPUT jack or amplified house speaker INPUT jacks.

You may have to disable the onboard microphone to use the connected hardware.
Realtek is very picky, same goes with speakers connected to the back and front at the same time, no sound. Disable the one you are not using.

Your front panel audio / microphone connector has an AC97 connector inside which looks like this:

http://www.digitaldingus.com/reviews/silverstone/fp34/fp34-usb-ac97.jpg

It is probably plugged into the motherboard somewhere. Try plugging it into the soundcard directly if it is in the motherboard. Or vice versa if it is plugged into the soundcard.

-Alex

Your computer has three similar connectors:

* GREEN - speaker/headphone output
* BLUE - input from cassette player or iPod
* PINK - input from microphone

Be sure to connect your ear-phones to the GREEN socket.

It would appear the unit thinks your McAAC microphone is inserted. Is it?

Automatically setting up for surround

sound (Auto MCACC)

The Auto MCACC Setup measures the acoustic characteristics of your listening area, taking into account

ambient noise, speaker size and distance, and tests for both channel delay and channel level. After you have set

up the microphone provided with your system, the receiver uses the information from a series of test tones

to optimize the speaker settings and equalization for your particular room.

Make sure you do this before moving on to Playing a source on page 11.

Important

• Make sure the microphone and speakers are not moved during the Auto MCACC Setup.

• Using the Auto MCACC Setup will overwrite any existing settings for the MCACC preset you select.

• Before using the Auto MCACC Setup, the headphones should be disconnected and the iPod

USB, XM or SIRIUS Radio function should not be selected as an input source.

1 Switch on the receiver and your TV.

2 Connect the microphone to the MCACC SETUP MIC

jack on the front panel.

Place the microphone so that it's about ear level at your normal listening position (use a tripod if possible). Make

sure there are no obstacles between the speakers and the microphone.

The Auto MCACC display appears once the microphone is connected.1

Note

1 • You can't use the System Setup menu in either the main or sub zone when the iPod USB, XM or SIRIUS Radio input source is selected. When you set ZONE 2 to ON (page 61), you can't use the System Setup menu.
• If you cancel the Auto MCACC Setup, or leave an error message

etc.

It's all in the manual.

Some background on the process...

http://www.pioneer.eu/eur/products/42/98/tech/AVAmplifierReceiver/AF_MCACC.html

Normally 3 standard sockets for audio, line in, line out and mic in, that are coloured blue green and pink respectively, for audio out connect to green socket (3.5mm jack plug)

in audio system you have three different levels.
1-mic level which is very small output level.
2-line level(like cd player output)which is higher than above.
3-speaker level is highest one which drive speaker and get sound out from it.
if you want to get control for number 1 and 2 you can use very simple sound mixer.(from radio shack-or other electronic store)
connect your sound source(mic-cdplayer)to the mixer and get out from mixer to amplifier.