Ok im using magix audio cleaning lab 2004
I'm not familiar with Magix, but according to their website, Audio Cleaning Lab 10 includes a compressor. See if ACL 2004 offers a similar feature. It'll be called compression, compress, compressor or some such, not sure where on the menu. Once you're in, the three primary settings with which to concern yourself: compression ratio, threshold, output gain. Magix may refer to those settings slightly differently. Where you set them depends on your recording.
The threshold determines the dB level above which to apply the compression. So, for example, if you specify a threshold of -9dB, the s/w will compress everything above -9dB, but not below -9dB.
The compression ratio determines how much to compress, i.e. how much to reduce the dynamic range. A very high ratio (e.g. 999:1) will effective flatten out your waveform right at the threshold defined. So, a threshold of -9dB and a ratio of 999:1, will basically result in a waveform that reaches no higher than approximately -9dB. A lower ratio, 2:1, for example, will result in a waveform that reaches higher than -9dB, but lower than it did previous to compression.
The output gain determines how much gain to add after compression takes place. So, in our extreme example with a threshold of -9dB, a ratio of 999:1, we've effectively compressed our recording so the peaks hit about -9dB. We would then set the output gain to +9dB to bring the peak levels back up near 0dB.
And if none of this makes sense after playing around with the Magix compressor, post a pic of the compressor screen here, + a pic of your waveform, and hopefully we can offer some initial values to try for the above settings (or the different settings offered by Magix's compressor).