No sound from mic xenyx1832 fx - Behringer Xenyx 1832fx Mixer 18 Input 32 Bus with Efx USB

Well, I would say it isn't dropping the level of "the whole pa", it is just dropping the level of the input you have plugged the fx into. Check the settings on your fx unit, there are usually input, output and mix controls that are independant of "the pa" and affect the amplitude of the signal going into your mixer from the fx unit.

usb b is for streaming digital media,not memory sticks,

• High-power dual DSP engine with improved digital effects and output processing including Feedback Ferret®, 28-band GEQ/5-band PEQ, delay and limiter
• USB 2.0 "A" connection to record directly to or playback from memory stick
• USB 2.0 "B" connection for streaming digital out
• 3-band EQ with sweepable mid-frequency and variable low cut filters
• 2 stereo channels with dual mic/line inputs
• 48 volt phantom power
• 6 Aux sends
• 4 subgroups
• 100mm faders
• Double the processing power of the original FX Series
• All new switching power supply design is more efficient than the original
• Silencer™ mic preamp XLR inputs
• Weight Packed: 45.00 lb(20.412 kg)
• Width Packed: 25"(63.5 cm)
• Height Packed: 36"(91.44 cm)
• Depth Packed: 11.5"(29.21 cm

• Owner's Manual
• FX™2 Mixer Series
• Cut Sheet

Did you turn on the phantom power? Condenser mics need phantom power(unless the have their own battery.)

Which clip light on what and what mics are you using?
The small room settings are from 10 so just turn the know to the setting you require and press it, this should set it.

The stadard way of setting up mics is to set the channel gain so the channel clip light just blinks occasionally when you are making the maximum sound you can into the mic.

For effects repeat this process using the aux send FX for each channel you want fx on (turn the rest to 0) and doing a balancing act between these and the aux send fx master so you can only just get the FX clip light blinking occasionally.

Next set your gain/attenuators on the amp(s) so its clip warning can just trigger when you are giving it 0db when you are playing the loudest you ever will.

A mic fading away could be the battery dying (in which case try using phantom power) or if they're radio replace the batteries before each service. If they're wired dynamic mics then it is possible there's some protection circuit somewhere that's reacting to the constant clipping and backing off the amp.

are you going from the board to a 'mic' input, or a 'line input' on the Mac? you will need to attenuate the signal to a mic input. try reducing output from the board by 50% and reduce the input level on the Mac by 50%, and see if the distortion is lessened or eliminated. From there balance board output to Mac Input until you find what sounds good outta the Mac.

If you are using the fx/send port to the mic-in port (I have no idea why you would want to do that) but nevertheless, check the red fx dial and make sure it is at 12 oclock and turn the pan dial to 12 oclock also. remember if you are using mic input 1 or 2 with a mic that requires Phantom power the button needs to be locked in the down position. OK im assuming you have checked and set your gain and volume levels on the 802 prior to plugging in your mic. If not do so now.(unplug all outputs and with mic plugged in speak into the mic while turning up gain until you get distortion which is indicated by a rewd light next to the "pan" button...once you see that light turn the gain dial back slightly and you should be set) have volume at 12 oclock on both l"evel1" and "main mix: dials. Now goto your windows desktop and right click on your volume control "speaker" icon. Click on "Playback device" you should see your mic in the list on enabled devices.If you dont see your mic in list right click the screen and click show disabled devices. Enable your device. If it is already enabled right click it and make sure it is not muted. finally go back to list of playback devices and right click your mic and click "configure speakers" run through the tests. close everything.mic should be working now. If it is not I suggest you plug your mic into either the line in from the fx/send or keep it in the mic-in port and plug the other end into the head phones port.Or better yet, get an rca to mini stereo jack and use the cd/tape out jacks to send your signal to the mic port of your computer......keep playing with it...you'll figure it out.There are so many different ways to hook up your perephrials its mind numbing sometimes.

Open the volume mixer on the pc and make sure the mic port is on. When you find it, click on the "advance" tab and there will be a check box allowing you to add 4db to the volume of the mic. Also, make sure it is plugged into the line in or mic input on pc.

The effects or FX section is on the top right of the mixer. On your vocal channels find the yellow knob marked FX and turn it to 0. Choose the effect you need using the Program knob (top right) for karaoke this will probably be 03 or 06. Start singing and turn up the yellow knob marked 3 - FX under AUX Sends until the LEDs above them hit -0db, no higher.
Now find the button marked FX - Main Mix and make sure it is UP.
Turn up the yellow knob (3 - FX) next to it until you can hear enough echo on your mic.

Check the FX to main level to make sure it is not too high. Also check the main FX fader level. Try turning each of these down and see if that corrects the issue. The FX fader should control the volume level of the FX globally (mon sends as well as main outs), and the FX to main should only affect the mains output. Make sure FX to mon1 and FX to mon2 are turned all the way down.
Also check what FX program your using and that the FX IN button is depressed, try starting w/ #10 (small room) and see how that sounds.

You CAN'T send ANYTHING to microphones since they are INPUT devices.

If you want apply effects to the audio coming FROM them then this is what you do:

Adjust the trim and faders for normal use and verify the mics are working.

NOW for those mics you want to put effects on, turn the knob labled "FX" above EACH mic FADER that you want effects on... it will be the orange topped ones... about the fourth one up ablve the PAN and the two MON knobs. Adjust these to send each mic into the effects mixing buss. Start by setting them at 12 o'clock. You will use these to proportion the amount of effects applied to individual mics.

Next, advance the FX fader/slider to around the Unity mark... this controls the amount of the FX mix buss goes into the FX processor.

Next adjust the knob above the MAIN fader that says FX to Main. This controls the amount of the FX that is sent into the MAIN mix buss...

We are almost there... Select the effect you want with the effect knob to the number of the effect you want... it will be blinking AFTER a change... the effect will NOT have changed yet... WHEN you want the effect to take effect, PRESS DOWN on the effect knob and the effect number will stop blinking and you now have the effects on those mics... ADJUST the three level things... the knbs under each channel to proportion between the mics... adjust the FX fader for the USUAL control of effect amount... and finally the FX to main knb to set the limit of the effect going to the MAINS.