# music.playInstructions() missing?
**URL:** https://forum.makecode.com/t/music-playinstructions-missing/3348
**Category:** Help
**Created:** [September 3, 2020, 11:11pm UTC](https://forum.makecode.com/t/music-playinstructions-missing/3348 "2020-09-03T23:11:28Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@kwx](https://forum.makecode.com/u/kwx)
#### Post date: [September 3, 2020, 11:11pm UTC](https://forum.makecode.com/t/music-playinstructions-missing/3348/1 "2020-09-03T23:11:28Z")
[https://arcade.makecode.com/developer/sound#sound-instructions](https://arcade.makecode.com/developer/sound#sound-instructions) mentions a `music.playInstructions()` API, does that currently work?
For background, I wanted to try modifying a white noise effect. The `playMelody` API works using `music.playMelody("~5 !200", 60)`, but it’s not very flexible.
I tried creating a sound instruction buffer, but got stuck trying to play it:
```auto
const mySound: Buffer = hex`0500010102027f7f00000101`;
music.playInstructions(mySound)
```
This shows an error in the editor: _Property ‘playInstructions’ does not exist on type ‘typeof music’._
I poked around in pxt-common-packages/blob/master/libs/mixer/melody.ts , and it doesn’t look as if `playInstructions(buffer)` exists. There’s a `queuePlayInstructions(when, buffer)`, but that’s apparently not exported?
Am I missing something, or is this currently not implemented?
As a side note, it seems that the noise output ignores the frequency. That seems by design for white noise, but it’s not very flexible. Would you be open to adding a simple square wave + pseudorandom selector combination, similar to what the 8-bit Atari POKEY chip used? See [https://www.atariarchives.org/dere/chapt07.php](https://www.atariarchives.org/dere/chapt07.php) for more discussion of that. Maybe expose this as a new implementation of the removed-but-still-documented metallic waveform? (See pxt-common-packages PR #875.)
---
### Author:  [@richard](https://forum.makecode.com/u/richard)
#### Post date: [September 3, 2020, 11:23pm UTC](https://forum.makecode.com/t/music-playinstructions-missing/3348/2 "2020-09-03T23:23:43Z")
Ah, sorry! I think you found the correct function and at some point we made it private.
Add this to your project to get it back:
```auto
namespace music {
//% shim=music::queuePlayInstructions
export function playInstructions(timeDelta: number, buf: Buffer) { }
}
```
The actual function is implemented in C++, that’s why there’s no body. The shim annotation tells the compiler to link things up correctly.
---
### Author:  [@kwx](https://forum.makecode.com/u/kwx)
#### Post date: [September 3, 2020, 11:31pm UTC](https://forum.makecode.com/t/music-playinstructions-missing/3348/3 "2020-09-03T23:31:35Z")
> [@richard](#):
>
> ```auto
> namespace music {
> //% shim=music::queuePlayInstructions
> export function playInstructions(timeDelta: number, buf: Buffer) { }
> }
>
> ```
Thanks, that works perfectly. In case it helps someone else, here’s my current sound effect after some tweaking:
```
// ww = waveform
// ffFF = frequency, low byte first
// ddDD = duration in milliseconds
// vvVV = volume
// wwWW = end volume
// ggGG = end frequency
// ww--ffFFddDDvvVVwwWWggGG
const mySound: Buffer = hex`050001010101111100000101`;
music.playInstructions(0, mySound)
```
---
### Author:  [@richard](https://forum.makecode.com/u/richard)
#### Post date: [September 3, 2020, 11:33pm UTC](https://forum.makecode.com/t/music-playinstructions-missing/3348/4 "2020-09-03T23:33:30Z")
Also, here’s some code you might find useful:
> **[pitch-and-amp-envelope](https://arcade.makecode.com/04565-72842-09513-65249)**
>
> Made with ❤️ in Microsoft MakeCode Arcade.
I wrote this a while ago. It’s a snippet of code to generate sound buffers with separate envelopes for amplitude and pitch. Press A to here a sound effect