Voice recorded is cracking sound

If it has a switch labeled conf/dict , put this switch in the dict mode. This switch is a record sensitivity control, in the conference position it will pick up almost any noise in the room. In the dict,position which is short for dictate, it will have less record sensitivity and will only pick up sounds very close to the microphone and eliminate background noises

You cannot remove the background noise of already recorded material unless you have special software for that purpose. It is available, but costly. To eliminate some background noise, you may in the future, try to muffle the microphone by turning down the volume and recording by moving the device closer to the sound sources. Some folks put a wind sock over the recorder, as you may have noticed during TV News recordings on street events or at a studio. Try a wool or thick sock over the recorder and see if that helps.

Nothing to worry about.
Your recorder has what is called a "Flash Memory" 2 GB I believe, which will retain whatever you recorded pretty much indefinitely.

You can copy this sound recording to the PC and use a program called Sound Forge 6 , which can edit off all the unwanted noise and feed back the edited sound to yourr player.
You can get help ffrom any video studio to do thsi job.
the other way is to use your tape recorder, edit and rerecord.

You need a low pass filter over the microphone, use a piece of high density, well in fact experiment with all types of densities of "Foam" and place it in front of the Mic Hole and this will work well, Sometimes wool or fur, or anything that will absorb all the low frequency signals without reducing quality will work, thats why you see those "Socks" on the microphones in the movies. Another way, is to get a VOX switch, this start recording at the sound of your voice, and although fast will usually cut off the first syllable or so, or the first few Msecs of time when it starts this can be used to advantage in this case.
Conversely, some VOX's that are built in, can cause a noise at beginning of recording.. Sometimes the noise is the Motor noise, and it's picked up as a low frequency noise, this can happen in cheaper units, an earth a bit loose, bad connections, to name a few.

I Don't know of any Olympus proprietory program to remove noise but if you can export it to a .wav format, it can then be edited and cleaned up digitally buy any semi pro sound editing software.such as sony's Sound Forge or cubase? cakewalk. software used for edit old records for conversion to cd may also help here. From there you can then save to cd for playback. If sound editing is beyond you, contact a recording studio or media house that produces commercials, they may be able to help.
Hope this is helpful

How can I clean up a voice recording. There is alot of background noice drownding out the voices. Any help would be great

check the voltage in batteries

Did it ever work right? When did the problem start?

Echoes:

There are many DSP modes with this unit. Echoing voices is probably one of them. This is a user setting. Look at the front panel for information regarding that. I imagine the Straight/Effect button might change it.

Have you read the manual and followed the specific menus for setting up the DSP modes?

Screeching, Scratchy Sound: I don't think this is related.

Did it ever work right? When did this problem start?

Is it from all sources? All channels? All DSP modes?

I need more to information be helpful.

when the recorder is plugged into the pc, it will flash pc and be powered by the pc... but when the recorder is not plugged in, then the batteries are needed to power on