Add different music blocks

[stephanemagnenat]

While the sound block in VPL1 allows users to compose some melodies, and allows activities such as Morse code, it is not very flexible. In VPL2, we have a version of this block with 8 notes and variable play speed, which is nice and appreciated in preliminary tests.

We can also imagine other types of blocks in relation with music:

1. percussion system, where the user records a rhythm on the tablet.
2. audio record/play on the robot

[stephanemagnenat]

This is important for an ongoing student project at GTC.

[Vincebecker]

What about something like this ? (design based on VPL1 but it's for the concept) I don't know what is possible to do.

[stephanemagnenat]

The idea is interesting, but not realistic for Thymio:

• The robot does not support multiple frequency excepted if the primary wave function is altered, which is not realistic.
• As Thymio is not able to produce properly-tuned notes, in VPL1 we do not use a scale or a piano roll. Indeed, it would be bad pedagogically to create a buggy metaphor.

For these reasons I think that for the frequency-based production, a score-like control, but explicitly not looking like a score (as in VPL), is still the best way. As suggested by @riedo, probably choosing the duration of notes is good, as is the ability to have silences.

[stephanemagnenat]

I have implemented a block similar to the one of VPL1, functional from commit 7f0552d379b1145bece311369d02c9e7dedc0584.