Solve : One to one merge/combine/mix on multiple (>100) audio files?

1.	Solve : One to one merge/combine/mix on multiple (>100) audio files?
Answer» I'm looking for help please. I have searched this subreddit and found a suggestion of FFMPEG however, after looking into it, I'm not sure how I would execute what I'm trying to do. I believe FFMPEG could be capable, but I don't KNOW the correct command(s) to use. I have ~100 audio tracks (.mp3) that I would like to merge/combine/mix with a watermark (.mp3). I am looking for advice on how I could apply this watermark to a BATCH of files at a time and export them individually. (doesn't have to be the full 1K)? I came ACROSS the software AGAudioWatermark which REQUIRES a $40 license, I'm wondering if there is a free solution out there?

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