Forum: General Discussion

It's a backtick [has a few names, you should see it above your tab key]
https://www.computerhope.com/jargon/b/backquot.htm

in vdj script backticks [`] are used in a few places, mostly when dealing with text, it tells vdj to use what is inside two back ticks as a script, and then parse it as text
for example, you set a variable to 6.
set 'myVar' 6
you could give a pad name something like this
myVar is `get_var 'myVar'`

what would be displayed is
myVar is 6

backticks have uses in more advanced script than just text, but the purpose is the same. parsing script,
set 'myVarSquare' `param_multiply "get_var 'myVar'" "get_var 'myVar'"`
it can be a little confusing when you need to use backticks as some param_ modifiers are expecting a script so they don't need backticks, other param_ modifiers might expect a script or a string so backticks are need to indicated we have passed it a script.

It's just one of those that you learn with practice.

sure, example [I won't give you the exact code, because figuring it out is part of the fun :) ]

script action
toggle test

button name
`var test 1 ? get_text "true" : get_text "false"`

the button is easy, just stop the rsi as part of the script.
repeat_stop 'RSIname'
the slider, nearly as easy - query if the rsi is running at the start, if it is do what you were going to do, if it's not start the rsi and do your thing

repeat_start 'RSIname' ? is running, carry on : not running, start the rsi, carry on

When do I do I need the back ticks on parameter? in this case level is defined by VDJ as value of a volume fader.

Is it advised to use `level` in

param_greater 50% `level` 

since the code below also works without the back ticks

param_greater 50% level 

param_greater is expecting 2 things, that could be an actions or values, or a mix
since it is expecting an action it can work with no spaced actions without ` ` so, level, get_level etc will be fine.
however, if there's a space in the action, lets say
effect_slider 'echo' 1
the space will mess things up so you would need to encapsulate ` ` , I believe encapsulate works with " " & ' ' too

param_equal, is slightly different, it is expecting either action, value or a string so, wrapping with " " or ' ' is reserved for strings.
Most of the time if doing a comparison on an action, wrapping the action in ` ` can't hurt there is one exception I'll try remember what it was.
*edit, I was remembering the wrong thing

i try again as post does not appear

`level & param_bigger 0.75 ? get_constant 0 : param_cast int`

backquote only not needed with "param_*' when action is one word only
most other verbs are needing backquotes or ignore them
as locodog said there are "exception" . trial & error only can help


All the above tests and comparisons are only working with scripts and physical sliders but not with custom_sliders
(custom sliders are not real sliders anymore for a while)

so that user slider have to be scripted in a way to make it work correctly
they need a specific variable (each) to handle value, specially using relative scroll, slide & move
(encoders, touchscreen, mouse roll)

set v[INDEX] & param_cast absolute & set v[INDEX] `get_var v[INDEX] & param_bigger 0.0 ? param_bigger 1.0 ? constant 1.0 : get_var v[INDEX] : constant 0.0` & param_add 0 `get_var v[INDEX]` & ...

set v : save the wrong absolute value (not in slider range)
param_cast absolute : convert param for future use
set v `..` : fix correct value for the slider
param_add 0.0 ... : hack to be able to overwrite parameter with correct absolute value and update slider display accordingly
& ... : now parameter is in range [0.0..1.0] and correct absolute value is passed to the script

holding ? sync : play_sync & action_deck 1 ? deck 2 beatlock on & deck 1 pitch_reset 0.5% & repeat_start 'lightBPM' 200ms 100 & get_pitch_zero ? repeat_stop 'lightBPM' & deck 2 beatlock off : nothing : deck 1 beatlock on & deck 2 pitch_reset 0.5% & repeat_start 'lightBPM' 200ms 100 & get_pitch_zero ? repeat_stop 'lightBPM' & deck 1 beatlock off : nothing