I'm currently working on a first update to Modizer (v1.1), so any feedback on current version is welcomed!
I've already optimized the artists listing (when selecting MODLAND then Artists/Files or Artists/Formats/Files in browser). Since there are more than 15000 entries, it was sometimes a bit slow as I was checking if some files for each artists were already downloaded. Now only the files listings are checked.
MDX/PDX playback is also working quite well (Sharp X68000) and I've fixed some minor bugs in playback (for example, on some formats, the last second was cut at the end of each song, ...)