picture on the left shows the S30 model, equipped with 61 light-weighted
keys, with initial touch and aftertouch.
The internal ROM includes the same AWM2 samples available in the
top model (24 Mb), but only one Plug-in board can be installed.
due to the lack of the mic/line A/D input, the optional PLG-VH harmonizer/vocoder
board cannot be installed too.
Nevertheless, S30 can be a good choice for those who like an easy
carriage (only 8 Kg.) better than a vocoder function or a weighted
S90 model features the same 88-note keyboard and the main features
of the S80, but the internal ROM has been expanded to 110 Mb, including
a multisampled Yamaha S700 piano (with 3 different velocity layers)
not found in any other Yamaha keyboard.
The number of available expansion slots for the synthesys plug-in
boards has been raised to 3, and the internal arpeggiator now features
248 preset types (instead of the S80 128 types)
The S90 also features a more large display and an USB interface
that has replaced the To Host connection.