love the wav download option

I tried to create a tone in Glicol (https://glicol.org/) with some random idea there and it works quite well:

``` o: squ ~pitch >> mul ~amp_env >> mul 0.4;

~amp_env: ~trigger >> envperc 0.02 0.19;

~pitch: ~pitch_env >> mul 200 >> add 200;

~pitch_env: ~trigger >> envperc 0.01 0.15;

~trigger: speed 4.0 >> seq 60

```