FujiConvert converts audio to Atari 8-bit media using various playback methods: https://lybrown.github.io/fujiconvert/ Here is an example converted to a The!Cart cartridge playing in stereo on dual POKEYs at 34kHz using the PCM4+4 method:
money pcm44 stereo 34125Hz thecart pal.zip (23MB)
I'm still working out the bugs and adding more features. Feedback appreciated.
FujiConvert 0.3
https://github.com/lybrown/fujiconvert
Changes
[PDM] Replaced all occurrences of "PCM4+4" with "PDM"
[PDM] Improved sound quality by restricting fine levels to values 1-14
[PDM] Changed "A" key to toggle between settings optimized for linear/non-linear mixing (black background/white background)
[PDM] Improved sound quality at very low volumes by adding small DC offset so that waveforms are centered in the fine level range. This