Working with an a cappella
An a cappella is a full vocal performance without the music, usually recorded to a fixed tempo. Match your project to its BPM first, then set the key: if the original key isn’t listed, find the vocal’s tonic by humming along with a bass note until it settles.
Most community vocals are dry, so you control the space with your own reverb and delay. Expect some breaths, clicks and room noise; a gate or gentle de-noising can clean them up without dulling the performance.
Credit the singer
Most free a cappellas exist because singers want their voices used, and the usual price is a credit. The detail view gives you a ready-made credit line to paste into your release notes, and every download through Sound Server includes it in ATTRIBUTION.md.