Lower the project tempo in your DAW
Time-stretch the audio without changing pitch
Use AI stem separation to isolate drums, vocals, and instruments
Slow each stem individually for cleaner results
Rebuild the arrangement at a lower BPM
Use beat detection to match the original tempo accurately
Apply tempo automation for gradual slowdowns
Use AI music tools with tempo control features
Export at the new slower BPM
Check for artifacts and correct them with editing
Preserve pitch if needed with high-quality time-stretch algorithms
Requantize MIDI parts to the new grid
Reduce drum pattern density to fit the slower tempo
Add longer reverb and delay tails to suit the slower pace