Psytrance bass line

```
do
d1 $ sound "pskick:2" # gain "1.1"
d2 $ every 4 (|+| up "2") $ sound "psbass*4" # up "-3 1"

do
d1 $ sound "pskick:5" # gain "1.1"
d2 $ every 4 (|+| up "2") $ sound "psbass*4" # up "-6 -2"
d4 silence

do
…