在 Sonic Pi 中控制音量

Question

I'm trying to code a polyphonic song in Sonic Pi, and I really need to be able to control the volume. I've looked through the Sonic Pi tutorials and found nothing. Please help.

Specifically, I've tried using [play :A4, amp: 3.0] and fiddling with the amplitude, but for some reason it doesn't work. Below is a code snippet of a sequence of two-note chords:

play :E3, release: 0.5, amp: 3.0
play :A4, release: 0.5, amp: 3.0
sleep 0.2
play :E3, release: 0.5, amp: 1.0
play :E3, release: 0.5, amp: 1.0
sleep 0.2
play :D3, release: 0.25, amp: 2.0
play :E3, release: 0.25, amp: 2.0
sleep 0.2
play :Fs3, release: 0.5
play :Gs4, release: 0.5

but the volume just isn't changing. What am I doing wrong?

Answer 1

我认为这可能是因为您使用的是带小数的数字，您可能必须使用 3 而不是 3.0、2 而不是 2.0 等等。如果不是，我真的不知道为什么它不起作用。