But we are talking about a hack that adds two audio signals to resemble 14bit. Because the playback is far from beeing perfect/linear etc., the result is not perfect 14bit. I would say the noise from artefacts is somehow comparable with something like 12bit.
Paula 14 bit sound becomes quite a lot better when you use a proper calibration table and properly down sampled audio files. No calibration: lowered quality. No proper down sampling: lowered quality. Add these two together, and it won't sound very good.
Furthermore, it's not really a hack, because Paula is a 14 bit D/A converter
