I need your help to combine two addons please

[Yukka]

Hello, I tried to combine these two addons but it seems I cant get it right... Can someone create one addon with these two addons please?

First addon plays a sound when the pet dies and the second addon play a sound when the pet life is about 35%. If possible I prefer when the addon play the sounds from the addon folder just like in the second addon. Thanks.

First addon:

local f = CreateFrame("Frame")
f:RegisterUnitEvent("UNIT_HEALTH", "pet")
f:SetScript("OnEvent", function()
  if not UnitExists("pet") or UnitHealth("pet") == 0 then
    PlaySound(6595)
  end
end)

Second addon:

local _,PetHealthAlert=...
local Frame=CreateFrame("ScrollingMessageFrame","!PHA",UIParent)    
Frame.Threshold=35
Frame.Warned=false
-- Initialize
function PetHealthAlert:Initialize()    
    Frame:SetWidth(450)
    Frame:SetHeight(200)
    Frame:SetPoint("CENTER",UIParent,"CENTER",0,0)  
    Frame:SetFont("Interface\\AddOns\\!PHA\\Res\\PHA_.TTF",30,"THICKOUTLINE")
    Frame:SetShadowColor(0.00,0.00,0.00,0.75)
    Frame:SetShadowOffset(3.00,-3.00)
    Frame:SetJustifyH("CENTER")     
    Frame:SetMaxLines(2)
    --Frame:SetInsertMode("BOTTOM")
    Frame:SetTimeVisible(2)
    Frame:SetFadeDuration(1)        
    HealthWatch:Update()
end
-- Update health warning
function PetHealthAlert:Update()    
    if(floor((UnitHealth("pet")/UnitHealthMax("pet"))*100)<=Frame.Threshold and Frame.Warned==false)then
        PlaySoundFile("Interface\\AddOns\\!PHA\\Res\\PHA.ogg")  
        Frame:AddMessage("- CRITICAL PET HEALTH -", 1, 0, 0, nil, 3)
        Frame.Warned=true
        return
    end
    if(floor((UnitHealth("pet")/UnitHealthMax("pet"))*100)>Frame.Threshold)then
        Frame.Warned=false
        return
    end 
end
-- Handle events
function PetHealthAlert:OnEvent(Event,Arg1,...)
    if(Event=="PLAYER_LOGIN")then
        PetHealthAlert:Initialize()
        return
    end 
    if(Event=="UNIT_HEALTH" and Arg1=="pet")then
        PetHealthAlert:Update()
        return
    end 
end
Frame:SetScript("OnEvent",PetHealthAlert.OnEvent)
Frame:RegisterEvent("PLAYER_LOGIN")
Frame:RegisterEvent("UNIT_HEALTH")