"Sure you know the Bliptronic5000®
or the Tenori-On™. If the first one lacks MIDI and
the second one is too expensive for you, you might
try this VST-version of a matrix stepsequencer:
Every column corresponds to one
step, each line represents a note. Just click the
buttons to enable the notes to be played. The orange
line runs thru while playing. Select the number of
steps to play (2-16), the speed in relation to the
host clock, the direction (forward, backward, random
etc.). Blip2000 outputs MIDI notes, so you can use
your favourite synth (-plugin) as the sound source.
MIDI channel, note length and velocity can be set.
With the fields on the left side you can adjust any
scale to be played – or use Blip2000 as a drum