FFMPEG Overlay of multiple videos

I am trying to overlay multiple videos on a base video, the videos get overlayd but the audio of the primary base video is lost, can someone help me achieving this? Also if I wan to add more videos what steps need to be taken.

Following is my command:

ffmpeg -i master_video.mp4 -i comment_1_offset.mp4 -i comment_2_offset.mp4 -filter_complex "[0:v][1:v]overlay=900:450:enable='between(t,06,12)'[bg];[bg][2:v]overlay=0:0:enable='between(t,8,15)'[v]; [1:a][2:a]amerge=inputs=2[a]" -map "[v]" -map "[a]" -ac 2 final_Idea.mp4

Thanks in Advance for any Help

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