Hi (nicolas :)) I was fixing the sound package and the EnvelopeEditorMorph shows a strange glitch EnvelopeEditorMorph openOn: (FMSound brass1) copy title: 'brass1' See ^^^^^^^^^^^^^^^^ below I have the impression that this related to float printString. Any idea how to fix it? buildLabels | scale x1 y1 y2 captionMorph loopStart offset | majorTickLength * minorTickLength < 0 ifTrue: [ minorTickLength := 0 - minorTickLength ]. self removeAllMorphs. caption ifNotNil: [ captionMorph := StringMorph contents: caption. offset := captionAbove ifTrue: [majorTickLength abs + captionMorph height + 7] ifFalse: [2]. captionMorph align: captionMorph bounds bottomCenter with: self bounds bottomCenter - (0 @ offset). self addMorph: captionMorph]. tickPrintBlock ifNotNil: ["Calculate the offset for the labels, depending on whether or not 1) there's a caption below, 2) the labels are above or below the ticks, and 3) the ticks go up or down" offset := labelsAbove ifTrue: [majorTickLength abs + minorTickLength abs + 2] ifFalse: [2]. caption ifNotNil: [captionAbove ifFalse: [offset := offset + captionMorph height + 2]]. scale := (self innerBounds width - 1) / (stop - start) asFloat. x1 := self innerBounds left. y1 := self innerBounds bottom. y2 := y1 - offset. "Start loop on multiple of majorTick" loopStart := (start / majorTick) ceiling * majorTick. loopStart to: stop by: majorTick do: [ :v | | x tickMorph | x := x1 + (scale * (v - start)). tickMorph := StringMorph contents: (tickPrintBlock value: v). ^^^^^^^^^^^^^^^^ printString? tickMorph align: tickMorph bounds bottomCenter with: x @ y2. tickMorph left < self left ifTrue: [ tickMorph position: self left @ tickMorph top ]. tickMorph right > self right ifTrue: [ tickMorph position: (self right - tickMorph width) @ tickMorph top]. self addMorph: tickMorph ]]