haLFO KeybRoll (private early build) - play notes with PC keyboard at Machines window.
Put it to Buzz\Gear\WaveEditors. You should have Overloader 1.5L8 or higher. Piece!...

CHANGES (! extra) (! fix) (+ new add) (- disable) (~ change) 
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13.05.2006 (mostly for gfx):
 (~) New focus rectangle style (not fixed);
 (+) Mouse wheel for zoom in/out;
 (+) Multi focus by right mouse buttom;
 (+) Multi move for machines;
 (+) Multi play for machines;
 (-) No more text about focused machine;