This is the current Sampler setup (instrument assignments, trims, ADSR, mixer levels, Source Sample comments) plus page metadata (title, artist, album, comments, licenses, links, theme). Source Samples are referenced by file path, not embedded — the actual files must exist under ASSETS/SourceSamples/. Copy this to save. To restore an earlier one, paste it here and click Confirm. Saving it as ASSETS/lmp-default-proj.json makes it load automatically next time.