Support for “Preset menu”.
[Update: Nyquist plug-ins now have the “Manage” button, which supports presets.
Limitation: There is as yet no way for the plug-in developer to define presets other than the “factory default”.]
(from this post https://forum.audacityteam.org/t/channel-mixer/14632/1 )
A preset menu can currently be implemented using the “Choice” widget, but the chosen preset values are not shown in the interface.
This proposal is for the sliders and other widgets to respond to the values selected in a “Preset” widget.
For example, if there are 2 sliders, the preset menu could hold values for each of those inputs. When a preset is selected, each of the sliders would change automatically to the value allocated by the preset. This would probably require that the choice widget was extended to hold value pairs.
Rather than just:
;control Variable "Select a preset from the list" choice "A,B,C" 0
there could be something like:
;control ListVariable "Select a preset from the list" preset "A,B,C" (-24 2.0)(-12 1.0)(-6 0.0)
;control varX "Input X" int "" (ListVariable 0) -48 0
;control varY "Input Y" real "" (ListVariable 1) 0.0 10.0
Where varX takes it’s value from the 0th element of ListVariable and varY takes it’s value from the next element.
If the values in ListVariable change (due to a different preset being selected) then controls varX and varY respond to the change in real time.