Let's say I have two audio files, both at 60 seconds length, .m4a or equivalent. When I overlap these two files, I get one audio file at 60 seconds. What is the technical necessary process to minimize quality loss?
Let's say I get another audio file, and I'd like to merge this file with the one I mentioned, now making one single audio file at 60 seconds, with 'three' original separate files. With my current method (simply adding), results in decreased quality after 3-4 overlappings/merges. What needs to be done? I found one example somewhere that simply changed the volume to 80% before merging, is there not more to it? If the files are 44.1, should I not increase the result by 44.1 for each overlapping (88.2, or 96), or would this not do anything?
As you now understand, I know little of this. Where can I learn about how this works?