Amplification of a speech signal in the recorded audio I have recorded an audio.
I dont know how it happened that only one sided speech is recorded and the other speech is recorded with a very low sound. Is there any solution to amplify the other side signal.  I have tried to amplify with AVS software but its also ampliying the noise in the audio.
any help would be much appreciated.
I wouldn't recommend amplifying the low signal because that will increase noise significantly. As was pointed out above, it's better to downmix to mono.
Open your recording in a DAW (e.g. Audacity), delete the quiet channel, then copy the loud signal into the deleted channel. Voila!