The audio compressor of PodCleaner normalizes the dynamics of all parts of the file and for all audio tracks, so each voice will be perfectly understandable and volume levels leveled with each other.
The following are the settings available for the compressor/normalizer:
By default attack is set to 0.01 seconds and decay to 5.0 seconds, while gain is set to -3 dB and ratio to 4. These values should be right of the most of the cases.
If the mixdown volume is too much high, try to lower gain to -6 dB.