when typing this.. yes brolly, that came to mind. damn.. i didnt test european wav files.. this way i would be pretty sure that there is a ntsc/pal problem . the wav loading to emulator you figure is a good hint, thanks !!
that was some search around fullmotionvideo forum & homepages of japanese developpers, and tried the 3 different basic & games as Zeplis, mappy, etcc but particularly Sideroll-B (which impressed me much from videos),
http://www.maroon.dti.ne.jp/youkan/mz700/zeplis/kuoushi, yes i recognize most of files from names,
i tried several programs, windows dos, windows tools converting to wav with the different settings, polarity switch, . as said, didnt try wav i rebuild to emulators while.. only .m12.. which doesnt help to figure if i did something wrong in wav converting..
http://www.sharpmz.org/mzf2wav.htmviewed this spanish video many times... even living near spain, my spanish is rough to get all the details..
https://www.youtube.com/watch?v=tEvnMqRa6Tcbut i had only one walkman to try off, the tape loader in mz721 is ok, i succeeded loading original tapes games (but no luck i did not have the Basic tape). because each japanese homebrew game i saw in youtube videos, was in need of basic load + game load.
now the white night i passed is times ago, and the machine is in some crate, but the fact is i didnt succeed anything comes back again..
i would have wanted to test, so wanted to buy the interface /usb from
https://twitter.com/youkan700 but i can't figure where to buy it online, beepshop seems having some but not online sale, it emerges sometimes in mI68 events & other rare places (to be..)
next time i'll have to dig more & more the details.. but if someone can answer if the problem is not about ntsc 60hz/ Pal 50hz regions.. (as the machine in europe & japan is full RGB Scart, i figured that was the same
.. that sounded perhaps too easy
)