gating effect

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i noticed that automating the volume doesn't work for long notes
is there any kind of automation i can do to achieve gating effect?

(other than typing in short notes and controlling the volume of each one)
arpeggiator has a gate. issent that what your looking for?
You can set perfect timing (rm temp-synch)
use ENV to set att /rel -but not for vst based presets, sadly
How does it not work?
i tried to re-create this sound in this video by drawing the same pattern for the volume of my synth in the automation editor
http://youtu.be/Jktn2WWgP_A (around 5:04)

but i couldn't make the volume control more quantized than the notes themselves
Ok, you're confusing note volumes with automation. The volume bars in the piano rolls are note volumes, there's only one per note, so of course those can't be done more accurately.

If you want more granular control of volume, you have to actually use automation. Hold ctrl and drag the volume knob of your instrument to an automation track. Then an automation pattern appears, double click that to open the automation editor. There you can draw the volume envelope curve. Put the automation on the same position in time as the instrument pattern, and you can hear how it affects the volume.