instruments missing on tracks, on SOME mobile phones/laptops when using you tube

[Electric water]

Hello Everyone,

Going mad here, using a Tascam DP 32 and all is great until i listen to a song iv'e put on you tube, and the bass guitar and chords are missing when played on certain friends mobile phones or laptops.
It is often a variety of things missing per recording, and it happens whether i use a cd copy or wav wire when i transfer to desktop to video maker.
Any advice folks?

 

[GearShift]

I had the same happen when I had an instrument far left and right. One copy in each and one side inverted. They cut each other out in mono playback. Problem fixed by moving one side out of time by a few milliseconds , which I had forgotten to do.

 

[mjbphotos]

Yup, check your mixes in mono for phase cancellations.

 

[Wundenbergs]

Definitely a phase issue when flipping to mono. You may even be able to flip the phase on one side, or delay the signal slightly! Stereo wideners have given me trouble in the past also.