Corona SDK piano app - swapping sounds, etc - function

Question

So basically I am making piano app in Corona SDK (my first project) and Im new to it. I've asked some questions about my problem on Corona forums but I don't have achieved exact answers that would help me, so I'm asking for your help. As I said im new, so it may be hard for me to crack out the needed code, but I know that you, more experienced Corona users, can easily do this.
I use this code for each key: (I know that media.playEventSound is pretty weak option to do that, I've seen some libraries about playing audio on Coronalabs like audio.loadSound etc. but if it is possible, of course, I'd like to stay with "media..."-based functions)
local widget = require("widget")
local C = media.newEventSound("C.mp3")
local button_C_Press = function(event)
media.playEventSound(C, button_C_Press)
end
local button_C = widget.newButton
{
defaultFile = "NewKey.png",
overFile = "NewKey2.png",
onPress = button_C_Press,
}
button_C.x = 20; button_C.y = 295
I want the piano to have 2 pedals that just switch its sound when they're pressed (I have in my project folder in total 3 different sound arragments - default and 2 pedal sustained audio files) and button that requires note letters on keys.
And here's my problem - how to get this all into one code?
I mean can you write me down there a code for one key like this sample I've posted below but including those features which I just mentioned please? I'd really love to have that solved..
Btw. I know soundTable/fileTable method, however it is called, but I think I have enough time to do each key individually - or use table method maybe - I only wish it was easy, beacuse it is my first project therefore should it be.
Sorry for my English and thanks!

Answer 1

You have asked for more code; I've got this recommended on Corona forums
Boolean variable:
local isPedalActive = false
And when they have touched the pedal button, then set it to true:
isPedalActive = true
And then add this to button_C_press function:
if event.phase == "began" then
if isPedalActive = true then
media.playEventSound(cPedal) --assuming you already loaded your audio above
end
end
Of course, if you have a large number of piano keys, it's better to don't do this individually for each function, rather:
Set a specific id for each key, in the widget.newButton table.
In the if statement, load the sound there but instead you would retrieve the button's id and play that mp3 file.
(that supports only one pedal)
--create table of key button ids and mp3 files for their pedal noises
local keys = {
{buttonId = "C", pedalNoise = "Cpedal.mp3"},
{buttonId = "D", pedalNoise = "Dpedal.mp3"}
}
function pianoKeys(event)
for i = 1, #keys do -- for each table in the keys table, load the sound for each key
local keySound = media.newEventSound(keys[i].buttonId .. ".mp3") -- normal sound loaded
local keypedalSound = media.newEventSound(keys[i].pedalNoise) --pedal sound loaded
function buttonPress(event) --When they press the key, detect if the pedal is active
if event.phase == "began" then
if isPedalActive == true then
media.playEventSound(keyPedalSound) --is active, play pedal sound
else
media.playEventSound(keySound) -- is not active, play regular sound
end
end
end
local pianoKey = widget.newButton({
id = keys[i].buttonId, -- place appropriate id
defaultFile = "new" .. keys[i].buttonId .. "key.png", -- place appropriate defaultFile
overFile = "new" .. keys[i].buttonId .. "key2.png", -- place appropriate overFile
onPress = buttonPress -- apply above function to each key
})
end
end
My problem - I dont't want to make sound table. I'd rather to do each key individually. Like that sample of one key's code I've posted below. But how? I dont know how to get everything into one valid thing :/ ( 2 pedals + note button)