idea #2

1) import your MP3 to one track,

2) then copy it to a second track

3) apply the plugin PG VOCAL REMOVER to one of the tracks

4) on the original track use volume envelopes to fade the track out slowly just as the part having lyrics you want to remove begins

5) on the track with the vocal remover plugin, use a volume envelope to start the volume at zero, then fade it in gradually where you want the lyrics gone

you'll probably have to tweak the envelopes to get a smooth transition, but the net result should be approximately what you want

The success of the vocal remover depends on how the song was originally mixed. Usually you can still hear a small amount of the vocal... but depending on your needs, that might be good enough.

or not. Your call.

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0