I need to take an audio sample (WAV/MP3/OGG/I don't care). Apply some manual processing to the sample, and then play it.
Simple enough, but I have no experience with programming audio. Is A4 or A5 easier, and is there a straight-forward example for doing that?
I looked through the A5 examples and they all seem to be way more complex than necessary.
I also intend to switch playback at times between the original file, and resampled ones. Preferably with seamless transitions.
 If it helps, the boundaries of the transitions aren't going to be rapid, and can have wiggle room to line up with audio buffers. I only need a response time of around a second for switching, but I absolutely need them to line up. Where one ends, the other should begin, as if they were the same wave. (Imagine switching between two identical waveforms, there should be no glitch or offset.)