Examples

The aRts Handbook
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# 3.3. Examples

Artsbuilder comes with several examples, which can be opened through File->Open Example.... Some of them are in the directory, some of them (which for some reason don't work with the current release) are left in the todo directory.

The examples fall into several categories:

- Standalone examples illustrating how to use each of the built-in arts modules (named example_*.arts). These typically send some output to a sound card.

- Instruments built from lower level arts modules (named instrument_*.arts). These following a standard convention for input and output ports so they can be used by the midi manager in artscontrol.

- Templates for creating new modules (names template_*.arts).

- Effects which can be used as reusable building blocks (named effect_*.arts) [ all in todo ]

- Mixer elements used for creating mixers, including graphical controls (named mixer_element_*.arts). [ all in todo ]

- Miscellaneous modules that don't fit into any of the above categories.

Detailed Description Of Each Module:

example_stereo_beep.arts

  Generates a 440Hz sine wave tone in the left channel and an 880Hz sine wave tone in the right channel, and sends it to the sound card output. This is referenced in the aRts documentation.

example_sine.arts

  Generates a 440 Hz sine wave.

example_pulse.arts

  Generates a 440 Hz pulse wave with a 20% duty cycle.

example_softsaw.arts

  Generates a 440 Hz sawtooth wave.

example_square.arts

  Generates a 440 Hz square wave.

example_tri.arts

  Generates a 440 Hz triangle wave.

example_noise.arts

  Generates white noise.

example_dtmf1.arts

  Generates a dual tone by producing 697 and 1209 Hz sine waves, scaling them by 0.5, and adding them together. This is the DTMF tone for the digit "1" on a telephone keypad.

example_atan_saturate.arts

  Runs a triangle wave through the atan saturate filter.

example_autopanner.arts

  Uses an autopanner to pan a 400 Hz sine wave between the left and right speakers at a 2 Hz rate.

example_brickwall.arts

  Scales a sine wave by a factor of 5 and then runs it through a brickwall limiter.

example_bus.arts

  Downlinks from a bus called "Bus" and uplinks to the bus "out_soundcard" with the left and right channels reversed.

example_cdelay.arts

  Downlinks from a bus called "Delay", uplinks the right channel through a 0.5 second cdelay, and the left channel unchanged. You can use artscontrol to connect the effect to a sound player and observe the results.

example_delay.arts

  This is the same as example_cdelay but used the delay effect.

example_capture_wav.arts

  This uses the Synth_CAPTURE_WAV to save a 400 Hz sine wave as a wav file. Run the module for a few seconds, and then examine the file created in /tmp. You can play the file with a player such as kaiman.

example_data.arts

  This uses the Data module to generate a constant stream of the value "3" and sends it to a Debug module to periodically display it. It also contains a Nil module, illustrating how it can be used to do nothing at all.

example_adsr.arts

  Shows how to create a simple instrument sound using the Envelope Adsr module, repetitively triggered by a square wave.

example_fm.arts

  This uses the FM Source module to generate a 440 Hz sine wave which is frequency modulated at a 5 Hz rate.

example_freeverb.arts

  This connects the Freeverb effect from a bus downlink to a bus outlink. You can use artscontrol to connect the effect to a sound player and observe the results.

example_flanger.arts

  This implements a simple flanger effect (it doesn't appear to work yet, though).

example_moog.arts

  This structure combines the two channels from a bus into one, passes it though the Moog VCF filter, and sends it out the out_soundcard bus.

example_pitch_shift.arts

  This structure passes the left channel of sound card data through the Pitch Shift effect. Adjust the speed parameter to vary the effect.

example_rc.arts

  This structure passes a white noise generator though an RC filter and out to the sound card. By viewing the FFT Scope display in artscontrol you can see how this varies from an unfiltered noise waveform.

example_sequence.arts

  This demonstrates the Sequence module by playing a sequence of notes.

example_shelve_cutoff.arts

  This structure passes a white noise generator though a Shelve Cutoff filter and out to the sound card. By viewing the FFT Scope display in artscontrol you can see how this varies from an unfiltered noise waveform.

example_equalizer.arts

  This demonstrates the Std_Equalizer module. It boosts the low and high frequencies by 6 dB.

example_tremolo.arts

  This demonstrates the Tremolo effect. It modulates the left and right channels using a 10 Hz tremolo.

example_xfade.arts

  This example mixes 440 and 880 Hz sine waves using a cross fader. Adjust the value of the cross fader's percentage input from -1 to 1 to control the mixing of the two signals.

example_pscale.arts

  This illustrates the Pscale module (I'm not sure if this is a meaningful example).

example_play_wav.arts

  This illustrates the Play Wave module. You will need to enter the full path to a .wav file as the filename parameter.

example_multi_add.arts

  This shows the Multi Add module which accepts any number of inputs. It sums three Data modules which produce inputs of 1, 2, and 3, and displays the result 6.

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