Decreased volume of stereo elements after decoding to MP3

Hey!

I faced the following problem: I made a little beat within my MPC One by using drums, a synth plugin and chopped slices of a breakbeat sample which I sampled in stereo.
I recorded the beat for testing on my presonus studiolive mixer via the SD card as a WAV file. The mix sounded the way I heard it before on the monitor speakers and headphones also - just as I wanted to.
Then I took the SD card and decoded that WAV file on my windows laptop into a MP3 file. After that process, certain elements of the chopped sample have way less volume and I can't hardly hear it anymore. I suggest it is because of missing stereo elements after decoding? I then tried to decode the WAV file on my macbook into m4a and everything was fine.
I wanted to use that little beat snippet for a short internet video, so I also separated the left channel of the wav file and took it for left and right - mono. Then the sample volume was right again.

I haven't thought about this issue before, when I was working in DAWs instead of standalone.

Would you prefer sampling in mono on the MPC to avoid these decoding effects?

Can‘t help, but:

DO NOT USE MP3 FOR VIDEO. MP3 is not discrete and in no way timing-accurate. For intermediary (non-consumer) usage ALWAYS render WAV (at least 48 kHz 24 bit) or similar, untill you produce the final video (with e.g. AC3) or similar.

Also, nowadays video containers exist that are happy with FLAC - latest version of Open Broadcast Studio will even happily record the audio track as FLAC !

This is highly dependent on the encoding (not: not decoding) parameters you used for your MP3.

Try exporting directly in the MPC using its built-in MP3 encoder, and the highest bitrate; see how it sounds.

Hey peeps,

thank you for your answers.
Problem solved: The sample snippet was of bad quality with phasing issues.