You want to favourite this toot:
Virtual Playing Orchestra is using sources under mixed licenses - some require you to credit the authors in your music or use a specific license for it.
VPO author suggests that your can use the instruments without attribution. You can't. That'd be in violation of the sample author's copyright.
Instead, use VSCO - these are clearly CC0 licensed instruments that are legally safe to use without violating anybody's rights.
More info here:
https://hilbricht.net/foss-sampled-instruments.html
