--https://github.com/Mokiros/roblox-FE-compatibility
if game:GetService("RunService"):IsClient() then error("Script must be server-side in order to work; use h/ and not hl/") end
local Player,Mouse,mouse,UserInputService,ContextActionService = owner
local RealPlayer = Player
do print("FE Compatibility code by Mokiros")local a=RealPlayer;script.Parent=a.Character;local b=Instance.new("RemoteEvent")b.Name="UserInput_Event"local function c()local d={_fakeEvent=true,Functions={},Connect=function(self,e)table.insert(self.Functions,e)end}d.connect=d.Connect;return d end;local f={Target=nil,Hit=CFrame.new(),KeyUp=c(),KeyDown=c(),Button1Up=c(),Button1Down=c(),Button2Up=c(),Button2Down=c()}local g={InputBegan=c(),InputEnded=c()}local CAS={Actions={},BindAction=function(self,h,i,j,...)CAS.Actions[h]=i and{Name=h,Function=i,Keys={...}}or nil end}CAS.UnbindAction=CAS.BindAction;local function k(self,l,...)local d=f[l]if d and d._fakeEvent then for m,e in pairs(d.Functions)do e(...)end end end;f.TrigEvent=k;g.TrigEvent=k;b.OnServerEvent:Connect(function(n,o)if n~=a then return end;f.Target=o.Target;f.Hit=o.Hit;if not o.isMouse then local p=o.UserInputState==Enum.UserInputState.Begin;if o.UserInputType==Enum.UserInputType.MouseButton1 then return f:TrigEvent(p and"Button1Down"or"Button1Up")end;if o.UserInputType==Enum.UserInputType.MouseButton2 then return f:TrigEvent(p and"Button2Down"or"Button2Up")end;for m,d in pairs(CAS.Actions)do for m,q in pairs(d.Keys)do if q==o.KeyCode then d.Function(d.Name,o.UserInputState,o)end end end;f:TrigEvent(p and"KeyDown"or"KeyUp",o.KeyCode.Name:lower())g:TrigEvent(p and"InputBegan"or"InputEnded",o,false)end end)b.Parent=NLS([==[local a=game:GetService("Players").LocalPlayer;local b=script:WaitForChild("UserInput_Event")local c=a:GetMouse()local d=game:GetService("UserInputService")local e=function(f,g)if g then return end;b:FireServer({KeyCode=f.KeyCode,UserInputType=f.UserInputType,UserInputState=f.UserInputState,Hit=c.Hit,Target=c.Target})end;d.InputBegan:Connect(e)d.InputEnded:Connect(e)local h,i;while wait(1/30)do if h~=c.Hit or i~=c.Target then h,i=c.Hit,c.Target;b:FireServer({isMouse=true,Target=i,Hit=h})end end]==],Player.Character)local r=game;local s={__index=function(self,q)local t=rawget(self,"_RealService")if t then return typeof(t[q])=="function"and function(m,...)return t[q](t,...)end or t[q]end end,__newindex=function(self,q,u)local t=rawget(self,"_RealService")if t then t[q]=u end end}local function v(d,w)d._RealService=typeof(w)=="string"and r:GetService(w)or w;return setmetatable(d,s)end;local x={GetService=function(self,t)return rawget(self,t)or r:GetService(t)end,Players=v({LocalPlayer=v({GetMouse=function(self)return f end},Player)},"Players"),UserInputService=v(g,"UserInputService"),ContextActionService=v(CAS,"ContextActionService"),RunService=v({_btrs={},RenderStepped=r:GetService("RunService").Heartbeat,BindToRenderStep=function(self,h,m,i)self._btrs[h]=self.Heartbeat:Connect(i)end,UnbindFromRenderStep=function(self,h)self._btrs[h]:Disconnect()end},"RunService")}rawset(x.Players,"localPlayer",x.Players.LocalPlayer)x.service=x.GetService;v(x,game)game,owner=x,x.Players.LocalPlayer end require("midi")
print(midi.Open(0))
print(midi.IsOpened())

local MIDIKeys = {
    [36] = { Sound = "a1"  }, -- C
    [37] = { Sound = "b1"  },
    [38] = { Sound = "a2"  },
    [39] = { Sound = "b2"  },
    [40] = { Sound = "a3"  },
    [41] = { Sound = "a4"  },
    [42] = { Sound = "b3"  },
    [43] = { Sound = "a5"  },
    [44] = { Sound = "b4"  },
    [45] = { Sound = "a6"  },
    [46] = { Sound = "b5"  },
    [47] = { Sound = "a7"  },
    [48] = { Sound = "a8"  }, -- c
    [49] = { Sound = "b6"  },
    [50] = { Sound = "a9"  },
    [51] = { Sound = "b7"  },
    [52] = { Sound = "a10" },
    [53] = { Sound = "a11" },
    [54] = { Sound = "b8"  },
    [55] = { Sound = "a12" },
    [56] = { Sound = "b9"  },
    [57] = { Sound = "a13" },
    [58] = { Sound = "b10" },
    [59] = { Sound = "a14" },
    [60] = { Sound = "a15" }, -- c'
    [61] = { Sound = "b11" },
    [62] = { Sound = "a16" },
    [63] = { Sound = "b12" },
    [64] = { Sound = "a17" },
    [65] = { Sound = "a18" },
    [66] = { Sound = "b13" },
    [67] = { Sound = "a19" },
    [68] = { Sound = "b14" },
    [69] = { Sound = "a20" },
    [70] = { Sound = "b15" },
    [71] = { Sound = "a21" },
    [72] = { Sound = "a22" }, -- c''
    [73] = { Sound = "b16" },
    [74] = { Sound = "a23" },
    [75] = { Sound = "b17" },
    [76] = { Sound = "a24" },
    [77] = { Sound = "a25" },
    [78] = { Sound = "b18" },
    [79] = { Sound = "a26" },
    [80] = { Sound = "b19" },
    [81] = { Sound = "a27" },
    [82] = { Sound = "b20" },
    [83] = { Sound = "a28" },
    [84] = { Sound = "a29" }, -- c'''
    [85] = { Sound = "b21" },
    [86] = { Sound = "a30" },
    [87] = { Sound = "b22" },
    [88] = { Sound = "a31" },
    [89] = { Sound = "a32" },
    [90] = { Sound = "b23" },
    [91] = { Sound = "a33" },
    [92] = { Sound = "b24" },
    [93] = { Sound = "a34" },
    [94] = { Sound = "b25" },
    [95] = { Sound = "a35" },
}

hook.Add("MIDI", "playablePiano", function(time, command, note, velocity)
    local instrument = LocalPlayer().Instrument
    if !IsValid( instrument ) then return end

    -- Zero velocity NOTE_ON substitutes NOTE_OFF
    if !midi || midi.GetCommandName( command ) != "NOTE_ON" || velocity == 0 || !MIDIKeys || !MIDIKeys[note] then return end

     instrument:OnRegisteredKeyPlayed(MIDIKeys[note].Sound)

    net.Start("InstrumentNetwork")
        net.WriteEntity(instrument)
        net.WriteInt(INSTNET_PLAY, 3)
        net.WriteString(MIDIKeys[note].Sound)
    net.SendToServer()
end)