This is an unofficial SDL2 port of an official SDL1 linux version.
http://www.drpetter.se/project_sfxr.html
Basic usage:
Start the application, then hit some of the buttons on the left side to generate random sounds matching the button descriptions.
Press "Export .WAV" to save the current sound as a WAV audio file. Click the buttons below to change WAV format in terms of bits per sample and sample rate.
If you find a sound that is sort of interesting but not quite what you want, you can drag some sliders around until it sounds better.
The Randomize button generates something completely random.
Mutate slightly alters the current parameters to automatically create a variation of the sound.
Advanced usage:
Figure out what each slider does and use them to adjust particular aspects of the current sound...
Press the right mouse button on a slider to reset it to a value of zero.
Press Space or Enter to play the current sound.
The Save/Load sound buttons allow saving and loading of program parameters to work on a sound over several sessions.
Volume setting is saved with the sound and exported to WAV. If you increase it too much there's a risk of clipping.
Some parameters influence the sound during playback (particularly when using a non-zero repeat speed), and dragging these sliders can cause some interesting effects. To record this you will need to use an external recording application, for instance Audacity. Set the recording source in that application to "Wave", "Stereo Mix", "Mixed Output" or similar.
Using an external sound editor to capture and edit sound can also be used to string several sounds together for more complex results.
Parameter description:
- The top four buttons select base waveform
- First four parameters control the volume envelope Attack is the beginning of the sound, longer attack means a smoother start. Sustain is how long the volume is held constant before fading out. Increase Sustain Punch to cause a popping effect with increased (and falling) volume during the sustain phase. Decay is the fade-out time.
- Next six are for controlling the sound pitch or frequency. Start frequency is pretty obvious. Has a large impact on the overall sound. Min frequency represents a cutoff that stops all sound if it's passed during a downward slide. Slide sets the speed at which the frequency should be swept (up or down). Delta slide is the "slide of slide", or rate of change in the slide speed. Vibrato depth/speed makes for an oscillating frequency effect at various strengths and rates.
- Then we have two parameters for causing an abrupt change in pitch after a ceratin delay. Amount is pitch change (up or down) and Speed indicates time to wait before changing the pitch.
- Following those are two parameters specific to the squarewave waveform. The duty cycle of a square describes its shape in terms of how large the positive vs negative sections are. It can be swept up or down by changing the second parameter.
- Repeat speed, when not zero, causes the frequency and duty parameters to be reset at regular intervals while the envelope and filter continue unhindered. This can make for some interesting pulsating effects.
- Phaser offset overlays a delayed copy of the audio stream on top of itself, resulting in a kind of tight reverb or sci-fi effect. This parameter can also be swept like many others.
- Finally, the bottom five sliders control two filters which are applied after all other effects. The first one is a resonant lowpass filter which has a sweepable cutoff frequency. The other is a highpass filter which can be used to remove undesired low frequency hum in "light" sounds.
Basically, I don't care what you do with it, anything goes.
To please all the troublesome folks who request a formal license, I attach the "MIT license" as follows:
--
Copyright (c) 2007 Tomas Pettersson
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.