[Lazarus] Update sound shop my next tutoring project

[Anthony Walter]

I have summer camp with several successive week long classes coming up and
am trying to put together some fun programming materials to engage the kids
and hopefully encourage them to explore more.

Yesterday I created the start of my next project for teaching kids on the
subject of computer programming using Lazarus and Free Pascal as the
teaching tools. Here is a brief video demonstrating what I have so far
along with a github page containing the sources.

https://cache.getlazarus.org/videos/sound-shop-example.mp4
https://github.com/sysrpl/SoundShop/

What the Sound Shop program does:

Sound Shop let's kids write functions and hear the results of those
functions. Right now it's dead simple to write wave form functions, but I
am going to enhance the program to allow for effect pipelines which map
unto keys. These pipelines will be a lot like the node in my Image Shop
program but will map to piano keys instead of the display.

I need to take a break from these example projects for a few days and work
on helping the school with schedules, but I thought I'd ask anyone who find
this interesting for some help.

Here are some of the things anyone can do to help:

Write a routine to load a music or song that will play on the keyboard
using the currently assigned piano keys. You can turn a key on or off by
simply typing Piano.Key[Index] := True/False. This will light up or dim the
key and play the corresponding mapped audio channel. Users can play already
along with with music or songs, so there's that feature. Obviously this
feature will also need a few demo music or song files. You can choose
however you want to store and read a music or song file.

Write an MP3 streamer that will convert in memory portions of an MP3 file
to audio samples. This will allow piano key channels to be mapped to sounds
other than computer generated waves. Also, I will eventually hook effects
up to both wave and MP3 samples. Please no third part libraries to convert
MP3 data to samples, only Pascal code. I will do this if no one takes up
the task.

Fix the issues with 32 bpp PNG images on Linux.

Some of the things I am going to do:

I am going to add a sound pipeline to the program to allow for effects and
other things to modify sounds before they are routed from the piano keys to
the underlying audio system. Each piano key will have its own pipeline.

I am going to add an oscilloscope to visualize the all the collectively
playing samples as they form waves. The scope will have a few controls to
adjust the phase, stretch, and amplitude.

I might add a bar staff allowing rectangular notes to be places on it and
stretched. Moving notes up or down on the staff changes the mapped piano
key, and stretching alters the note duration.

If anyone want to contribute it would be much appreciated.

Thanks

Anthony
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