Roland TR-707/727 modifications

-closed hat, open hat, crash, and ride (whistle, quijada, and star chime) decay controls
-closed hat, open hat, crash, and ride (whistle, quijada, and star chime) vca inputs
-multiple trigger outputs
-707/727 rom switching (both sets of sounds in one machine)
-new 555 sample clocks for each sound (independent pitch control over each pair of sounds)

tr-707 pitch mod mp3
tr-72707 pic
tr-72707 guts

good scan of crucial schematic page

tr-707 yahoo group