Question: Microphone volume on recordings is low.How to fix this?
Check that both speakers are on the same level. By default the recording is stereo, your voices from one speaker and the person you are talking with from another.
MP3 Skype recorder is recording directly from audio devices most of time. Hence no internal Skype cancellation and volume adjustment are on recordings. Please try to increase volume of your mic in windows settings. Right click sound icon in system tray. Choose 'Recording devices'. Choose your mic from the list and click Properties button. On the new screen go to 'Levels' tab. Move microphone slider to the right, you can also try Microphone Boost slider setting.
Please also consider using headset to avoid echo, the way radio shows avoiding echo on recordings.
If the above doesn't help check that proper microphone is selected in recorder.
Open Advanced settings (https://voipcallrecording.com/Manual/advanced_audio_settings)
Turn off Detect microphone ans speakers automatically
Select the microphone to record manually from the drop-down list
Don't forget to Save