Playing a `microbit.Sound` or `audio.SoundEffect` crashes beta.2

[microbit-carlos]

To replicate:

from microbit import *

audio.play(audio.SoundEffect())
display.show("A")

from microbit import *

audio.play(Sound.HAPPY)
display.show("A")

In both cases the sound will play, but it will get stuck playing the last tone and play that indefinitely, never reaching the line to display "A".

Looks like it was introduced by this CODAL commit: lancaster-university/codal-microbit-v2@31095d5

More info in:

• Playing a sound effect crashes MicroPython lancaster-university/codal-microbit-v2#228

[microbit-carlos]

To have a working MicroPython hex for the Python Editor, we'll see tomorrow to maybe create a new CODAL tag with the commit reverted, or maybe go back in MicroPython to CODAL v0.2.40.

[dpgeorge]

This will block #118, #119, #122 (which require features from CODAL 0.2.40).

[microbit-carlos]

Okay, we've got a hotfix patch to resolve this and I'll release beta.3 right away.

• Updates codal-microbit-v2 to v0.2.42-hotfix.1 and sets the release to beta.3 #125

The commit reverted was to solve a issue with the uBit.audio.soundExpressions.play() function returning before the sound finished playing (about 15ish ms or so), so it should be safe to revert:

• Inserted a 1-buffer playback delay to the end of playback to sync external events lancaster-university/codal-microbit-v2#210
• uBit.audio.soundExpressions.play() (blocking version) continues to output sound after the function returns lancaster-university/codal-microbit-v2#189

Thanks @JohnVidler!