For too long I've recorded multiple song ideas on the same project, a mix of improvised audio and midi, and, disregarding the project BPM, it is ALL free of any tempo. The audio tracks have been edited, shifted etc. I always planned to 'sort them out' and lock to grid tempo, quantize, add grooves, delays etc. Now I discover it is far from simple. Any muso friendly guide reference to detecting tempo etc would be welcome! Starting over is a mountain of work as I have refined and arranged etc.