One tool per action

Pencil tool * LMB-click on canvas: add note (grid-size lenght or separate default) * LMB-drag on canvas: draw note (could be limited to dra inside a row and otherwise switch to selection rectangle) * LMB-click on note: select note (makes directly adding overlapping equal notes impossible. should be acceptable as that's hardly ever needed and can still be acomplished by moving notes.) [delete would be nice for consistency with drum editing, where notes are usualy toggled, but won't be expected and seem drastic] * LMB-drag on note: move note * Ctrl: switch to Select tool * Shift: switch to Resize tool * Alt/Meta: switch to Velocity tool Hit tool, for percussion, like Pencil tool, except * LMB-drag: add/toggle hits in a row Brush tool for adding notes in a row? Select tool (should perhaps only appear via Ctrl, not be a selectable tool, as it can be expected to be used not several times in a row, but rather once inbetween other operations) * LMB-click: toggle selection state of closest note * LMB-drag: rectangular selection * Shift-LMB-drag: add rectangular selection * Alt/Meta-LMB-drag: substract from selection Delete tool * LMB-click: delete note * LMB-drag: delete all in span * Ctrl: switch to Select * Shift: switch to Resize tool * Alt/Meta: switch to Velocity tool Move Tool * LMB-click: move closest note there * LMB-drag: move closest whole note * Ctrl: switch to Select tool * Shift: switch to Resize tool * Alt/Meta: switch to Velocity tool Resize Tool (Note_on/off move) * LMB-click: move closest Note_On/Off there * LMB-drag: move closest Note_On/Off * Ctrl: switch to Select * Shift: switch to Pencil tool * Alt/Meta: switch to Velocity tool Quantize tool? Velocity tool (overload Gain tool?) * LMB-click: set closest velocity * LMB-drag: adjust closest velocity * Ctrl: switch to Select * Shift: switch to Resize tool * Alt/Meta: switch to Velocity tool Independent of current tool: * Ctrl-RMB-click: edit click: note dialog? * Shift-RMB-click: delete