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Dunno what it takes to license a song and get it heard, …
Live? Not your issue as long as the promoter or venue is licensed with the PRO or the song’ publisher.

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I know very little about Sampletank. I have the free version …
Unlike Kontakt, The SampleTank instrument player is free. The various price points are for the number of licensed libraries you get but the player is the same for all of them. UVI is the same.

They don’t make this very clear. I learned this after doing a major upgrade that included ST3 and then had major problems in Mojave. SampleTank 4 had just come out and I was not happy about having to upgrade something I bought a few weeks earlier. Ok… I’ll download ST4 CS (the free version) since it comes with some libraries, right? Every problem I was having went away since all of my libraries now worked in ST4. That’s when I finally understood. I did need an upgrade but the one I needed was free. Meanwhile, IK Support was trying to help me get ST3 working over Mojave. BTW, 4 has a learning curve so watch the intro videos.

Back to the OP, SampleTank 4 CS, UVI Player and the free version of Kontakt/Guitar Rig all come with libraries. After you get familiar with these and MIDI basics, they and other companies have plenty to sell you — don’t worry, they’ll email you a lot. The learning period is on their dime, not yours.

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