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For each standard envelope opt, there's a `cutoff_` equivalent opt in the `:tb303` synth. So, to change the cutoff attack time we can use the `cutoff_attack:` opt. Copy the code above into an empty buffer and hit Run. You'll hear a strange sound warble in and out. Now start to play. Try changing the `cutoff_attack:` time to `1` and then `0.5`. Now try `8`.
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Deconstructing the TB-303
 
The design of the original TB-303 is actually pretty simple. As you can see from the following diagram there's only 4 core parts.
 
![TB-303 Design](../../../etc/doc/images/tutorial/articles/A.05-acid-bass/tb303-design.png)
 
First is the oscillator wave - the raw ingredients of the sound. In this case we have a square wave. Next there's the oscillator's amplitude envelope which controls the amp of the square wave through time. These are accessed in Sonic Pi by the `attack:`, `decay:`, `sustain:` and `release:` opts along with their level counterparts. For more information read Section 2.4 'Duration with Envelopes' in the built-in tutorial. We then pass our enveloped square wave through a resonant low pass filter. This chops off the higher frequencies as well as having that nice resonance effect. Now this is where the fun starts. The cutoff value of this filter is also controlled by its own envelope! This means we have amazing control over the timbre of the sound by playing with both of these envelopes. Let's take a look:
 
use_synth :tb303
with_fx :reverb, room: 1 do
live_loop :space_scanner do
play :e1, cutoff: 100, release: 7, attack: 1, cutoff_attack: 4, cutoff_release: 4
sleep 8
end
end
 
For each standard envelope opt, there's a `cutoff_` equivalent opt in the `:tb303` synth. So, to change the cutoff attack time we can use the `cutoff_attack:` opt. Copy the code above into an empty buffer and hit Run. You'll hear a strange sound warble in and out. Now start to play. Try changing the `cutoff_attack:` time to `1` and then `0.5`. Now try `8`.
`:tb303`
Notice that I've passed everything through a `:reverb` FX for extra atmosphere - try other FX to see what works!
 
Finally, here's a piece I composed using the ideas in this tutorial. Copy it into an empty buffer, listen for a while and then start live coding your own changes. See what wild sounds you can make with it! See you next time...
 
use_synth :tb303
use_debug false

with_fx :reverb, room: 0.8 do
live_loop :space_scanner do
with_fx :slicer, phase: 0.25, amp: 1.5 do
co = (line 70, 130, steps: 8).tick
play :e1, cutoff: co, release: 7, attack: 1, cutoff_attack: 4, cutoff_release: 4
sleep 8
end
end

live_loop :squelch do
use_random_seed 3000
16.times do
n = (ring :e1, :e2, :e3).tick
play n, release: 0.125, cutoff: rrand(70, 130), res: 0.9, wave: 1, amp: 0.8
sleep 0.125
end
end
end
 
A.6 Musical Minecraft
 
Musical Minecraft
 

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  3. Indonesian
For each standard envelope opt, there's a `cutoff_` equivalent opt in the `:tb303` synth. So, to change the cutoff attack time we can use the `cutoff_attack:` opt. Copy the code above into an empty buffer and hit Run. You'll hear a strange sound warble in and out. Now start to play. Try changing the `cutoff_attack:` time to `1` and then `0.5`. Now try `8`.
`:tb303`
a year ago
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Source string location
A.05-acid-bass.md:138
String age
a year ago
Last updated
11 months ago
Source string age
a year ago
Translation file
etc/doc/lang/sonic-pi-tutorial-id.po, string 1414