Perhaps an easier way is to mute the bass track at the beginning and the ending using F5, enter your solo on either the Melody or Soloist track, and change that track's patch (sound) to bass.

Otherwise, if you edit the existing bass track, you must Freeze it, or else it will be overwritten when you regenerate the song. The Melody and Soloist tracks are not regenerated.

You can also copy the bass track to the Melody or Soloist track, where you can edit without freezing, and then Mute the bass track entirely.

But I would do it the first way, above.



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