A TB303 emulator
The Tb303 suite emulates the classic Roland TB-303 "Bass Line" analog synth.
(Just the synth, not the sequencer; VSS has a separate sequencer actor.)
To use the Tb303 implementation, load tb303.so and create an actor of type Tb303Actor.
Note that it won't make any sound after you send the BeginSound command
until you also send the Retrigger command. So the usual order of commands
- hSound = BeginSoundPaused SetFoo 42.0 SetBar 43.0 ... ;
- Retrigger hSound;
- SetPause hSound 0;
In addition to the messages understood by all generator actors, the Tb303Actor understands the following messages.
If the optional parameter time is specified in any of the following messages, then
the corresponding parameter is linearly modulated from the old value to the specified value over the
duration of time seconds after receipt of the command. In the case of the commands
SetAll[Param] (which set the value for all handlers spawned by a particular actor),
the default [Param] is always set immediately on receipt of the command, regardless of
- SetFreq hActor x
SetAllFreq hActor x time
- Set the default frequency for new instances to x.
- SetFilterCutoff hActor x
SetAllFilterCutoff hActor x time
- Set the default filter cutoff for new instances to x.
- SetResonance hActor x
SetAllResonance hActor x time
- Set the default resonance for new instances to x.
- SetEnvMod hActor x
SetAllEnvMod hActor x time
- Set the default envelope modulation for new instances to x.
- SetEnvDecay hActor x
SetAllEnvDecay hActor x time
- Set the default envelope decay for new instances to x.
Tb303 handler messages
In addition to the messages understood by all handlers, the handler for the tb303 algorithm understands the following messages:
(All these funky names are what the original Roland box used.)
- Retrigger hSound
- Play the attack portion of a sound (the phreeeeoooooooo part before
it settles down to the steady-state portion).
- SetFreq hSound x time
- Set the frequency to x Hz (10 to 1000 works best; default 110).
- SetFilterCutoff hSound x time
- Set the "vowel color" to x (0 to 1, default 0);
from 0 to 1, the sound goes through oo, oh, ah, ee and gets louder
at the same time.
- SetResonance hSound x time
- Set the narrowness of the filter to x (0 to 1, default 0).
At higher values you can hear individual harmonics during the
attack of a sound.
- SetEnvMod hSound x time
- Set the amount of "modulation" in the attack envelope to x
(0 to 1, default 0). At higher values, the attack starts higher
and finishes on a lower (less buzzy, more sinetone) steady-state sound.
- SetEnvDecay hSound x time
- Set the duration of the attack portion to x
(0 to 1, default 0). 0 corresponds to about 1/10 second,
1 to about 5 or 6 seconds.