This is fixed in SVN: the effect visualiser now knows to distinguish PC notes (where the value range is [0,999]) from standard effects (where the value range is [0,255], sometimes capped). Standard effect nodes are blue and PC note nodes are yellow:

There are 5 "fill" modes, available from the left dropdown under the visualiser:
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Overwrite with effect: Moving a node replaces the effect type or PC note on that row with the effect specified in the right dropdown.
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Fill blanks with effect: Moving a node where an effect or PC note already exists changes only the param value, but blank effect fields are set to the effect type specified.
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Overwrite with PC note: Moving a node blows away whatever is on that row and writes a PC note. The PC note's type (smooth vs normal), plugin and parameter are inferred from the first visualised row. If that row isn't a PC note, fall back to a default of PCS 01 000.
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Fill blanks with PC note: Moving a node where an effect or PC note already exists changes only the param value, but blank rows are set to PC note. The nature of the PC note is inferred as above.
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Never change effect type: Moving a node only changes the param value. The effect type / PC note-ness is never changed, and blank rows remain blank.
The mode that is selected by default when the visualiser is opened depends on the first row of the selection:
- If the first row is a standard effect, the mode is set to overwrite with that effect.
- If the first row is a PC note, the mode will be set to overwrite with PC notes.
The PC note stuff is only available when you're working with an MPTM.
Not to be too cocky, but I wouldn't mind if the param editor could be more useful with interpolation and not only linear interpolation but maybe also exponential interpolation?
Hi Rakib, what kind of exponential interpolation are we talking about here? A command like the existing linear interpolation pattern transform, or something more profound that would somehow impact behaviour between rows? In the latter case, do you have any thoughts on how that might work? Are we talking all effects or just plugin param control?