Unable to get playdate.sound.controlsignal to work

SDK Bug Reports
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4

new theory, see problem description below. and sorry for the essay

my values in my events are [0, 127] it appears. the channel pan effect only wants values [-1, 1]

feeding it values way over 1 may be causing an issue. im imaging writing a function that turns the numbers [0-127] into their relative position between [-1, 1] but im assuming this is what interpolate is supposed to do?

i wrote something that loops through the events of the control signal, and i can print out individual values for 'step,' 'value,' and 'interpolate.' But when I try to reset their values using the = operator I don't see any changes reflected in the events.

my theory is that if i could change, or interpolate, the event values to between -1 and 1 that might fix my issue.

hey thank you for the quick and actionable reply. really means a lot when stuck on a project. switching between 1 and 0 indexed languages is... let's call it fun! sorry to bother you with more but here's my results.

im getting some changes to audio now but they are bizarre. I took video, VOLUME JUMP WARNING.

with the addEvent line added to this code, I do hear a change. that's good. it's registering it exists. but the change is kinda crazy. rather than affecting the channel's pan, I get a huge jump in volume and distortion on what otherwise is a soft sine wave.

let me know if im doing anything you'd do differently.

more misc info

  • im on mac m1, simulator only for now
  • im automating the control signals inside of ableton
  • i am exporting midi files from ableton, then merging them via this method
-- from SDK example, slight modifications
function newsynth()
	local s = sfx.synth.new(sfx.kWaveSine)
	s:setVolume(0.3)
	s:setAttack(.4303)
	s:setDecay(0.37)
	s:setSustain(0.4)
	s:setRelease(.257)
	return s
end

function newinst(n)
	local inst = sfx.instrument.new()
	for i=1,n do
		inst:addVoice(newsynth())
	end
	return inst
end

-- my code
function mergeMidiTest()

  local midi = 'sounds/output.mid'
  s = sfx.sequence.new(midi)

  ch00 = sfx.channel.new()
  ch00:setVolume(.35)

local track1 = s:getTrackAtIndex(1)
  track1_control_signals = track1:getControlSignals()
  for i=1,#track1_control_signals do
    track1_control_signals[i]:addEvent(0,0, false)
    print("controller type: "..track1_control_signals[i]:getControllerType())
    if track1_control_signals[i]:getControllerType() == 10 then -- Pan
      local newMod =  track1_control_signals[i]
      ch00:setPanMod(newMod)
    end
  end
  
  local newInst1 = newinst(1)
  track1:setInstrument(newInst1)
  ch00:addSource(newInst1)

  s:setTempo(666)
  s:setLoops(1, s:getLength()+300, 0)
  printTable(track1_control_signals)
  print(track1_control_signals[1])
  s:play()
end

mergeMidiTest()