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Is there way to remove the vocal from VOB or MKV song whereas the songs have singer on 1st track but not on second?

I'm sorry, but we do not have any program that allows to process a soundtrack of a video file in our offer.

Loved the program right to that point.
Working with lots of vietnamese they have 30k song libraries in vob format and not being able to switch from audio track 1 to audio track 2 is only problem with selling them on your software.
Plays the files fine, just that switch.

Guess I just sell them laptop with VLC loaded only

Love your product and will promote it to other customers

You should be able to switch a vocal track on/off with "Multiplex control" slider during playback in Siglos Karaoke Player/Recorder or Siglos Karaoke Professional.

VOB files have 2 tracks embedded and siglos only loads or plays from track one which is full vocal track and 2nd track is performance track without vocal.

Multiplex won't change between the 2 tracks