Ksp reference Manual

1:
Insert Effect
0:
Send Effect
For busses, this parameter specifies the actual bus:
$NI_BUS_OFFSET + [0-15] one of the 16 busses
For internal modulators, this parameter specifies the modulation slider which you
can retrieve by using:
find_target(,,)
For all other applications, set this parameter to 
-1
Examples
on init
declare ui_knob $Volume (0,1000000,1000000)
end on
on ui_control ($Volume)
set_engine_par($ENGINE_PAR_VOLUME,$Volume,-1,-1,-1)
end on
Controlling instrument volume
Engine Parameter Commands
128
KSP Reference Manual

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on init
declare ui_knob $Freq (0,1000000,1000000)
declare ui_button $Bypass
end on
on ui_control ($Freq)
set_engine_par($ENGINE_PAR_CUTOFF,$Freq,0,0,-1)
end on
on ui_control ($Bypass)
set_engine_par($ENGINE_PAR_EFFECT_BYPASS,$Bypass,0,0,-1)
end on
Controlling the cutoff and bypass button of any filter module in the first slot of the first group
on init
declare ui_knob $Knob (-100,100,1)
declare $mod_idx
$mod_idx := find_mod(0,"FILTER_ENV")
declare $target_idx
$target_idx := find_target(0,$mod_idx,"ENV_AHDSR_CUTOFF")
end on
on ui_control ($Knob)
if ($Knob < 0)
set_engine_par ($MOD_TARGET_INVERT_SOURCE,...
1,0,$mod_idx,$target_idx)
else
set_engine_par ($MOD_TARGET_INVERT_SOURCE,...
0,0,$mod_idx,$target_idx)
end if
set_engine_par($ENGINE_PAR_MOD_TARGET_INTENSITY,...
abs($Knob*10000),0,$mod_idx,$target_idx)
end on
Controlling the filter envelope amount of an envelope to filter cutoff modulation in the first group.
Note: the the filter envelope has been manually renamed to "FILTER_ENV".
on init
declare ui_knob $Vol (-0,1000000,1)
end on
on ui_control ($Vol)
set_engine_par($ENGINE_PAR_VOLUME,$Vol,-1,-1,$NI_BUS_OFFSET + 15)
end on
Controlling the amplifier volume of the 16
th
 bus