Can’t get channel.getWetSignalLevel():getValue() to return anything else than a value of 0.0

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After creating a synth, modulating its amplitude with an LFO, and adding it to a channel, I wanted to get the output volume for the channel to draw it on screen.

However, I found that the signal returned by :getWetSignalLevel() or :getWetSignalLevel() always has a value of 0.0 when calling :getValue() on it.

I was expecting the value of the signal to match the synth’s oscillating amplitude?

Here’s some Lua code to illustrate the setup with which I’m always getting back a level at 0.0:

local pd <const> = playdate
local sd <const> = pd.sound


local mod = sd.lfo.new(sd.kLFOSine)
mod:setRate(1)
mod:setCenter(0.6)
mod:setDepth(0.2)

local synth = sd.synth.new()
synth:setAmplitudeMod(mod)

local channel = sd.channel.new()
channel:addSource(synth)

synth:playNote(330)

function pd.update()
	
	print("Level", channel:getWetLevelSignal():getValue())
	
end
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