hmm.. thats some time ago.. no pictures i'm afraid..
but looking back in my diary
i found :
xe 562b0 pin 16 connect to pin 11 on ym 2420 will transpose keyboard down (a few octaves if i remember well)
for the sweet fm bass
certainly there's more to explore apart from the datacut mod, it will crash, but not lethal if you stay on this chips
(i hope
) yes there's more, but i dídn't wrote it down that time.. just experiment !
and here is my killer advice to turn the pss140/270 into breakbeat riddim machine :
search for an electromagnetic buzzer, like the kingstate kss1206 or simmilar.
you might find it on an old soundcard or modem.
connect this in series with an 100 ohm lin pot and a trimpot, set at +/-50 ohm , between pin 11 and pin 12
now start a rhythm and slowly tweak the pot... suprise suprise
you betta do it before s-cat reads this and run with the patent